Accruals Accruals Accruals Accumulated other comprehensive income Accumulated other comprehensive loss Accumulated other comprehensive income [member] Total accumulated other comprehensive loss AOCL [member] Segment adjusted EBITDA represents earnings from continuing operations before income tax expense or benefit, net interest expense, other finance costs or income, depreciation, amortization of software and other identifiable intangible assets, the Company's share of post-tax earnings or losses in equity method investments, other operating gains and losses, certain impairment charges, fair value adjustments and corporate related items (Corporate & Other). Consolidated adjusted EBITDA is the adjusted EBITDA of each segment and Corporate & Other. Adjusted EBITDA Adjusted EBITDA Adjusted weighted average number of ordinary shares outstanding Diluted Adjustments for amortisation expense Amortization expense Adjustments for decrease (increase) in other assets Other financial assets Adjustments for decrease (increase) in other current assets Prepaid expenses and other current assets Adjustments for decrease (increase) in trade and other receivables Trade and other receivables Adjustments for deferred tax expense Deferred tax Adjustments for deferred tax of prior periods Deferred tax (benefit) charge Adjustments for depreciation expense Depreciation Adjustments for gains (losses) on change in fair value of derivatives Fair value adjustments Adjustments for income tax expense Income taxes Adjustments for increase (decrease) in deferred income Deferred revenue Adjustments for increase (decrease) in employee benefit liabilities Non-cash employee benefit charges Adjustments for increase (decrease) in other liabilities Other financial liabilities Adjustments for increase (decrease) in trade and other payables Payables, accruals and provisions Adjustments for other miscellaneous to reconcile profit (loss) to net cash flow from (used in) operating activities. Adjustments for other miscellaneous Other Adjustments to reconcile profit (loss) [abstract] Adjustments for: Adjustments for unrealised foreign exchange losses (gains) Net (gains) losses on foreign exchange and derivative financial instruments Adjustments related to employee benefit plans. Adjustments related to employee benefit plans Amount related to employee benefit plans After IFRS 15 adoption. After IFRS 15 adoption [member] After IFRS 15 adoption [member] After IFRS 2 amendments. After IFRS 2 amendments [member] After IFRS 2 amendments [member] Aggregate continuing and discontinued operations [member] Aggregate continuing and discontinued operations [member] Aggregated measurement [member] Aggregated measurement [member] All levels of fair value hierarchy [member] All levels of fair value hierarchy [member] Amendment Flag Amendment Flag Americas [Member] Americas [member] Amortisation, intangible assets other than goodwill Amortization Amortization Asia Pacific [Member] Asia Pacific [member] Assets Assets Total assets Assets [abstract] Assets Assets and liabilities classified as held for sale [axis] Assets and liabilities classified as held for sale [axis] Assets and liabilities not classified as held for sale [member] Assets and liabilities not classified as held for sale [member] Assets arising from insurance contracts Cash surrender value of life insurance policies Assets liabilities at amortized cost. Assets Liabilities At Amortized Cost [member] Assets liabilities at amortized cost [member] Assets (liabilities) at fair value through earnings. Assets Liabilities At Fair Value Through Earnings [Member] Assets/ (liabilities) at fair value through earnings [member] Assets recognised from costs to obtain or fulfil contracts with customers Deferred commissions At fair value [member] At fair value [member] Bank and other. Bank And Other [Member] Bank and Other [Member] Bank overdrafts Bank overdrafts Basic and diluted earnings (loss) per share Basic and diluted earnings (loss) per share Basic and diluted earnings (loss) per share from continuing operations From continuing operations Basic and diluted earnings (loss) per share from discontinued operations From discontinued operations Basic and diluted earnings per share [abstract] Basic and diluted earnings (loss) per share: Borrowings Borrowings Borrowings, adjustment to interest rate basis Credit facility, rate of interest added to reference rate Borrowings by name [axis] Borrowings by name [axis] Borrowings by name [member] Borrowings by name [member] Borrowings, interest rate Debt instrument, interest rate Borrowings, maturity Debt instrument, maturity year Maturity date Borrowings maximum borrowing capacity. Borrowings Maximum Borrowing Capacity Commercial paper programs Borrowings, original currency Debt instrument, original currency Borrowings repaid date. Borrowings Repaid Date Notes, repaid date Bottom of range [member] Bottom of range [member] CANADA Canada [member] Total capital of the entity. Capital1 Capital Capital requirements [axis] Capital requirements [axis] Capital requirements [member] Capital requirements [member] Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents classified as part of disposal group held for sale Cash and cash equivalents in assets held for sale Cash and cash equivalents if different from statement of financial position Cash and bank overdrafts at end of period Cash and bank overdrafts at beginning of period Cash and cash equivalents if different from statement of financial position [abstract] Cash and bank overdrafts at end of period comprised of: Cash flows from losing control of subsidiaries or other businesses, classified as investing activities Proceeds from disposals of businesses and investments Cash flows from (used in) financing activities Net cash used in financing activities Cash flows from (used in) financing activities [abstract] FINANCING ACTIVITIES Cash flows from (used in) financing activities, continuing operations Financing cash flows from continuing operations Cash flows from (used in) financing activities, discontinued operations Financing cash flows from discontinued operations Cash flows from (used in) increase (decrease) in current borrowings Net borrowings (repayments) under short-term loan facilities Cash flows from (used in) investing activities Net cash used in investing activities Cash flows from (used in) investing activities [abstract] INVESTING ACTIVITIES Cash flows from (used in) investing activities, continuing operations Investing cash flows from continuing operations Cash flows from (used in) investing activities, discontinued operations Investing cash flows from discontinued operations Cash flows from (used in) operating activities Net cash provided by operating activities Cash flows from (used in) operating activities [abstract] OPERATING ACTIVITIES Cash flows from (used in) operating activities, continuing operations Operating cash flows from continuing operations Cash flows from (used in) operating activities, discontinued operations Operating cash flows from discontinued operations Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities Acquisitions, net of cash acquired Cash trade and other receivables. Cash Trade and Other Receivables [Member] Cash trade and other receivables [member] Categories of financial assets [axis] Categories of financial assets [axis] Categories of financial liabilities [axis] Categories of financial liabilities [axis] Categories of related parties [axis] Categories of related parties [axis] Changes in fair value of credit derivative [abstract] Changes in fair value of credit derivative [Abstract] Classes of financial instruments [axis] Classes of financial instruments [axis] Financial instruments, class [member] Financial instruments, class [member] Classes of intangible assets and goodwill [axis] Classes of intangible assets and goodwill [axis] Classes of intangible assets other than goodwill [axis] Classes of intangible assets other than goodwill [axis] Classes of share capital [axis] Classes of share capital [axis] Share capital [member] Share capital [member] Commercial paper. Commercial Paper 1 [Member] Commercial paper [member] Commercial papers issued Commercial papers issued Common shareholders. Common shareholders [abstract] Common shareholders: Communication expense Telecommunications Components of equity [axis] Components of equity [axis] Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Items that have been or may be subsequently reclassified to net earnings: Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] Items that will not be reclassified to net earnings: Comprehensive income Total comprehensive income (loss) Total comprehensive income Total comprehensive income Comprehensive income attributable to [abstract] Comprehensive income (loss) for the period attributable to: Comprehensive income, attributable to non-controlling interests Non-controlling interests - discontinued operations Comprehensive income, attributable to owners of parent Continuing operations Computer software Computer software, net Computer software [member] Computer software [member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] This member stands for possible obligations that arise from past events and whose existence will be confirmed only by the occurrence or non-occurrence of one or more uncertain future events not wholly within the control of the entity; or, present obligations that arise from past events but are not recognised because (a) it is probable that an outflow of resources embodying economic benefits will be required to settle the obligations; or (b) the amount of the obligations cannot be measured with sufficient reliability. It also represents the standard value for the 'Classes of contingent liabilities' axis if no other member is used. Contingencies Contingencies (note 18) Contingent consideration Contingent consideration Contingent consideration Continuing and discontinued operations [axis] Continuing and discontinued operations [axis] Continuing operations [member] Continuing operations [member] Corporate and Other [Member] Corporate & other (includes reuters news) [member] Credit facilities. Credit facility [member] Credit facilities [member] Credit facility One [member] Credit facility One [member] Credit facility maturing in November 2021 [member] Credit facility Two [member] Credit facility Two [member] Credit facility that expires on November 21, 2018 [member] Current accrued expenses and other current liabilities Payables, accruals and provisions Total payables, accruals and provisions Current assets Current assets Current assets other than non-current assets or disposal groups classified as held for sale or as held for distribution to owners Current assets excluding assets held for sale Current borrowings and current portion of non-current borrowings Current indebtedness Current portion Current derivative financial liabilities Derivative instrument liability, current portion Current financial assets Other financial assets Current Fiscal Year End Date Current Fiscal Year End Date Current liabilities Current liabilities Current liabilities other than liabilities included in disposal groups classified as held for sale Current liabilities excluding liabilities associated with assets held for sale Current provisions Provisions Data expenses. Data Expenses Data Deferred income Deferred revenue Deferred tax assets Deferred tax Deferred tax liabilities Deferred tax Depreciation expense Depreciation Derivative financial liabilities Derivative instrument liability Derivatives [member] Derivatives used for hedging [member] Description of accounting policy for compliance with IFRSs if applied for interim financial report. Description Of Accounting Policy For Compliance with IFRSs if applied for Interim Financial Report [text block] Basis of preparation Disclosure of expected impact of initial application of new standards or interpretations [text block] Recent Accounting Pronouncements Disclosure of expected impact of initial application of new standards or interpretations [abstract] Disclosure of expected impact of initial application of new standards or interpretations [abstract] Disclosure of expected impact of initial application of new standards or interpretations [line items] Disclosure of expected impact of initial application of new standards or interpretations [line items] Disclosure of expected impact of initial application of new standards or interpretations [table] Disclosure of expected impact of initial application of new standards or interpretations [table] Disclosure of initial application of standards or interpretations [text block] Changes in accounting policy Dilutive effect of share options on number of ordinary shares Effect of stock options and TRSUs Disaggregation of revenue by geography. Disaggregation of revenue by geography [Table Text Block] Summary of Disaggregation of Revenue by Geography Disaggregation of revenue by type. Disaggregation of revenue by type [Table Text Block] Summary of Disaggregation of Revenue by Type The entire disclosure of assets and liabilities held for sale. Disclosure of assets and liabilities held for sale [text block] Summary of Assets and Liabilities as Held for Sale Disclosure of assets and liabilities held for sale [line items] Disclosure of assets and liabilities held for sale [line items] Disclosure of assets and liabilities held for sale [line items] Disclosure of business description and basis of presentation. Disclosure of business description and basis of presentation [line items] Disclosure of business description and basis of presentation [line items] Disclosure of cash flow statement [text block] Supplemental Cash Flow Information Disclosure of changes in accounting estimates [table] Disclosure of changes in accounting estimates [table] Disclosure of changes in accounting policies [Abstract]. Disclosure of changes in accounting policies [Abstract] Disclosure of changes in accounting policies [Abstract] Disclosure of information about changes in the unrealized fair value of available-for-sale investments. Disclosure of changes in unrealized fair value of available-for-sale investments [abstract] Disclosure of changes in unrealized fair value of available-for-sale investments [Abstract] Disclosure of changes in working capital and other items. Disclosure Of Changes In Working Capital And Other Items [Abstract] Disclosure Of Changes In Working Capital And Other Items [Abstract] Disclosure Of Changes In Working Capital And Other Items [Text Block] Disclosure Of Changes In Working Capital And Other Items [Text Block] Details of Changes in Working Capital and Other Items Disclosure of classes of share capital [abstract] Disclosure of classes of share capital [abstract] Disclosure of contingent liabilities [text block] Contingencies Disclosure of debt instruments [text block] Summary of Debt and Related Derivative Instruments Disclosure of detailed information about borrowings [abstract] Disclosure of detailed information about borrowings [abstract] Disclosure of detailed information about borrowings [text block] Summmary of Information Regarding Notes Repaid Disclosure of detailed information about borrowings [line items] Disclosure of detailed information about borrowings [Line Items] Disclosure of detailed information about borrowings [table] Disclosure of detailed information about borrowings [table] Disclosure of detailed information about components of operating expenses. Disclosure Of Detailed Information About Components Of Operating Expenses [text block] Components of Operating Expenses The cash flows from income taxes paid or refunded. Disclosure of detailed information about income tax paid (refund) [Text Block] Details of Income Taxes Paid Adjustments for non-cash items to reconcile profit (loss) to net cash flow from (used in) operating activities that the entity does not separately disclose in the same statement. [Refer: Profit (loss)] Disclosure of detailed information about Other In Consolidated Statement Of Cash Flow [Text Block] Details of Other in the Consolidated Statement of Cash Flow The disclosure of detailed information about other non-current assets. Disclosure of Detailed Information About Other Non-Current Assets [Text Block] Summary of Other Non-Current Assets Disclosure of detailed information about Payables Accruals And Provisions [Text Block] Disclosure of detailed information about Payables Accruals And Provisions [Text Block] Schedule of Payables, Accruals and Provisions Disclosure of detailed information about revenue by type. Disclosure of Detailed Information About Revenue by Type [Text Block] Summary of Revenues by Type Disclosure of disaggregation of revenue from contracts with customers [abstract] Disclosure of disaggregation of revenue from contracts with customers [abstract] Disclosure of disaggregation of revenue from contracts with customers [line items] Disclosure of disaggregation of revenue from contracts with customers [line items] Disclosure of disaggregation of revenue from contracts with customers [table] Disclosure of disaggregation of revenue from contracts with customers [table] Disclosure of discontinued operations [text block] Discontinued Operations Disclosure of dividends [text block] Summary of dividend declared and paid Disclosure of earnings per share [text block] Earnings Per Share Earnings used to determine consolidated earnings per share and earnings per share from continuing operations. Disclosure of earnings per share from continuing operations explanatory Reconciliation of Earnings Used for Earnings per Share Calculations Disclosure of entity's operating segments [text block] Segment Information Disclosure of expenses [text block] Operating Expenses Schedule of financial instruments categorized within the fair value hierarchy. Disclosure of Fair Value Hierarchy [Text Block] Fair Value Hierarchy Disclosure of fair value measurement of assets [abstract] Disclosure of fair value measurement of assets [abstract] Disclosure of fair value measurement of assets [line items] Disclosure of fair value measurement of assets [line items] Disclosure of fair value measurement of assets [table] Disclosure of fair value measurement of assets [table] Disclosure of finance cost [text block] Finance Costs, Net The disclosure of finance (income) cost. [Refer: Finance (income) cost]. Disclosure Of Finance Income Costs Explanatory Components of Finance Costs, Net, Include Other Finance Costs (Income) Schedules disclosing information related to financial assets and liabilities. Disclosure Of Financial Assets And Liabilities [Text Block] Summary of Financial Assets and Liabilities Disclosure of financial assets and liabilities. Disclosure Of Financial Assets And Liabilities [Line Items] Disclosure of Financial Assets and Liabilities [Line Items] Disclosure of financial assets and liabilities table. Disclosure Of Financial Assets And Liabilities [Table] Disclosure Of Financial Assets And Liabilities [Table] Disclosure of detailed information about financial instruments [abstract] Disclosure of detailed information about financial instruments [abstract] Disclosure of financial instruments [text block] Financial Instruments Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [Line Items] Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Disclosure of geographical areas [abstract] Disclosure of geographical areas [abstract] Disclosure of geographical areas [text block] Summary of Revenues by Geography Disclosure of geographical areas [line items] Disclosure of geographical areas [line items] Disclosure of geographical areas [table] Disclosure of geographical areas [table] Disclosure of income taxes. Disclosure of income taxes [abstract] Disclosure of income taxes [abstract] Line items represent concepts included in income taxes. Disclosure Of Income Taxes [Line Items] Disclosure Of Income Taxes [Line Items] Disclosure of income tax [text block] Taxation Disclosure of interest expense [text block] Components of Finance Costs, Net, Include Interest Expense (Income) Disclosure of non-adjusting events after reporting period [abstract] Disclosure of non-adjusting events after reporting period [abstract] Disclosure of non-adjusting events after reporting period [line items] Disclosure of non-adjusting events after reporting period [Line Items] Disclosure of non-adjusting events after reporting period [table] Disclosure of non-adjusting events after reporting period [table] Disclosure of operating segments [abstract] Disclosure of operating segments [Abstract] Disclosure of operating segments [text block] Revenues and Adjusted EBITDA by Segment Disclosure of operating segments [line items] Disclosure of operating segments [Line Items]