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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of information about receivables, contract assets, and deferred revenue (contract liabilities) from contracts with customers | The following table provides information about receivables, contract assets, and deferred revenue (contract liabilities) from contracts with customers:
|  |  | December 31 2018 |  |  |  | January 1 2018 |
|  |  | $ |  |  |  | $ |
Receivables |  |  |  |  |  |  |  |
Trade receivables and holdbacks |  |  | 821.9 |  |  |  | 816.1 |
Unbilled receivables |  |  | 384.6 |  |  |  | 315.6 |
Contract assets |  |  | 59.7 |  |  |  | 69.2 |
Deferred revenue |  |  | (174.4 | ) |  |  | (196.4 | )
Total Consulting Services |  |  | 1,091.8 |  |  |  | 1,004.5 |
Significant Increases (Decreases) in Contract Assets and Deferred Revenue |
|  |  |  |  |  |  | For the year ended December 31, 2018 |
|  |  |  |  |  |  | Contract Assets |  |  |  | Deferred Revenue |
|  |  | Note |  |  |  | $ |  |  |  | $ |
Acquisitions |  |  |  |  |  |  | 0.7 |  |  |  | 7.2 |
Discontinued operations and disposition of subsidiaries |  |  | 8 |  |  |  | (15.3 | ) |  |  | (59.3 | )

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- Definition The entire disclosure for revenue from contracts with customers. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Section Presentation -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=sect_Presentation&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The explanation of the significant changes in the contract assets and the contract liabilities. [Refer: Contract assets; Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Text block [abstract] + References No definition available. + Details
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