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Intangible Assets - Summary of Intangible Assets (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | CAD 449.5 |
Ending Balance | 262.4 | CAD 449.5
Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 590.5 | 232.1
Additions | 6.1 | 354.2
Removal of fully amortized assets | (38.8) | (27.8)
Impact of foreign exchange | (26.4) | 5.7
Ending Balance | 430.5 | 590.5
Gross carrying amount [member] | Not internally generated [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Additions | 5.7 | 25.7
Gross carrying amount [member] | Internally generated [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Additions |  | 0.6
Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 141.0 | 94.0
Current year amortization | 82.1 | 77.6
Removal of fully amortized assets | (38.8) | (27.8)
Impact of foreign exchange | (5.2) | (2.8)
Ending Balance | 168.1 | 141.0
Client relationships [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 314.0 |
Ending Balance | 199.1 | 314.0
Client relationships [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 399.0 | 146.3
Additions | 3.2 | 246.9
Removal of fully amortized assets | (13.8) | (0.3)
Impact of foreign exchange | (20.8) | 6.1
Ending Balance | 289.5 | 399.0
Client relationships [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 85.0 | 59.3
Current year amortization | 30.2 | 26.8
Removal of fully amortized assets | (13.8) | (0.3)
Impact of foreign exchange | (3.8) | (0.8)
Ending Balance | 90.4 | 85.0
Contract backlog [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 36.3 |
Ending Balance | 10.3 | 36.3
Contract backlog [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 55.5 | 12.9
Additions | 2.7 | 50.6
Removal of fully amortized assets | (6.2) | (9.5)
Impact of foreign exchange | (4.1) | 1.5
Ending Balance | 47.9 | 55.5
Contract backlog [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 19.2 | 6.0
Current year amortization | 26.4 | 22.3
Removal of fully amortized assets | (6.2) | (9.5)
Impact of foreign exchange | (1.8) | 0.4
Ending Balance | 37.6 | 19.2
Software [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 69.4 |
Ending Balance | 38.7 | 69.4
Software [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 97.6 | 63.0
Additions |  | 27.6
Removal of fully amortized assets | (15.7) | (16.5)
Impact of foreign exchange | 0.4 | (2.8)
Ending Balance | 65.6 | 97.6
Software [member] | Gross carrying amount [member] | Not internally generated [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Additions | 5.7 | 25.7
Software [member] | Gross carrying amount [member] | Internally generated [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Additions |  | 0.6
Software [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 28.2 | 25.4
Current year amortization | 17.2 | 21.6
Removal of fully amortized assets | (15.7) | (16.5)
Impact of foreign exchange | 1.0 | (2.3)
Ending Balance | 26.9 | 28.2
Other intangibles [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 29.8 |
Ending Balance | 14.3 | 29.8
Other intangibles [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 38.4 | 9.9
Additions | 0.2 | 29.1
Removal of fully amortized assets | (3.1) | (1.5)
Impact of foreign exchange | (1.9) | 0.9
Ending Balance | 27.5 | 38.4
Other intangibles [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | 8.6 | 3.3
Current year amortization | 8.3 | 6.9
Removal of fully amortized assets | (3.1) | (1.5)
Impact of foreign exchange | (0.6) | (0.1)
Ending Balance | 13.2 | 8.6
Lease disadvantages [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | (4.8) |
Ending Balance | (2.7) | (4.8)
Lease disadvantages [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | (10.3) | (8.1)
Additions |  | (2.8)
Removal of fully amortized assets | 2.5 | 0.5
Impact of foreign exchange | 0.6 | 0.1
Ending Balance | (7.2) | (10.3)
Lease disadvantages [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Beginning Balance | (5.5) | (4.1)
Current year amortization | (1.9) | (1.9)
Removal of fully amortized assets | 2.5 | 0.4
Impact of foreign exchange | 0.4 | 0.1
Ending Balance | (4.5) | CAD (5.5)
Innovyze, Inc. [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (103.3) |
Innovyze, Inc. [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (8.3) |
Innovyze, Inc. [member] | Client relationships [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (78.1) |
Innovyze, Inc. [member] | Client relationships [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (7.2) |
Innovyze, Inc. [member] | Software [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (19.1) |
Innovyze, Inc. [member] | Software [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (1.1) |
Innovyze, Inc. [member] | Other intangibles [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (6.1) |
Other [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (3.3) |
Other [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (2.7) |
Other [member] | Software [member] | Gross carrying amount [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | (3.3) |
Other [member] | Software [member] | Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about intangible assets [line Items] |  |
Disposals | CAD (2.7) |

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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