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Property and Equipment - Schedule of Property and Equipment (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | CAD 213.9 |
Property plant and equipment | 212.6 | CAD 213.9
Engineering equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 58.8 |
Property plant and equipment | 59.3 | 58.8
Office equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 36.4 |
Property plant and equipment | 34.0 | 36.4
Leasehold improvements [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 102.0 |
Property plant and equipment | 101.4 | 102.0
Assets under finance leases [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 0.8 |
Property plant and equipment | 0.1 | 0.8
Other [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 15.9 |
Property plant and equipment | 17.8 | 15.9
Gross carrying amount [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 414.8 | 364.5
Additions | 62.1 | 58.7
Additions arising on acquisitions | 0.8 | 54.4
Disposals | (78.5) | (56.5)
Transfers |  | (0.1)
Impact of foreign exchange | (11.5) | (6.2)
Property plant and equipment | 387.7 | 414.8
Gross carrying amount [member] | Engineering equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 131.9 | 129.0
Additions | 21.2 | 15.8
Additions arising on acquisitions | 0.2 | 15.7
Disposals | (33.4) | (27.1)
Transfers | 0.1 | 1.4
Impact of foreign exchange | (3.3) | (2.9)
Property plant and equipment | 116.7 | 131.9
Gross carrying amount [member] | Office equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 82.0 | 70.7
Additions | 6.8 | 12.0
Additions arising on acquisitions | 0.1 | 6.2
Disposals | (24.9) | (5.9)
Transfers | (0.8) | 0.5
Impact of foreign exchange | (1.6) | (1.5)
Property plant and equipment | 61.6 | 82.0
Gross carrying amount [member] | Leasehold improvements [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 166.9 | 130.9
Additions | 29.4 | 27.7
Additions arising on acquisitions | 0.5 | 28.5
Disposals | (16.4) | (18.7)
Transfers | 0.2 | (0.5)
Impact of foreign exchange | (5.1) | (1.0)
Property plant and equipment | 175.5 | 166.9
Gross carrying amount [member] | Assets under finance leases [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 0.9 | 2.2
Additions arising on acquisitions |  | 0.8
Disposals | (0.8) | (0.6)
Transfers |  | (1.4)
Impact of foreign exchange |  | (0.1)
Property plant and equipment | 0.1 | 0.9
Gross carrying amount [member] | Other [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 33.1 | 31.7
Additions | 4.7 | 3.2
Additions arising on acquisitions |  | 3.2
Disposals | (3.0) | (4.2)
Transfers | 0.5 | (0.1)
Impact of foreign exchange | (1.5) | (0.7)
Property plant and equipment | 33.8 | 33.1
Accumulated depreciation and amortization [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 200.9 | 206.4
Current year depreciation | 54.6 | 51.2
Disposals | (76.7) | (51.6)
Impact of foreign exchange | (3.7) | (5.1)
Property plant and equipment | 175.1 | 200.9
Accumulated depreciation and amortization [member] | Engineering equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 73.1 | 82.3
Current year depreciation | 18.2 | 17.6
Disposals | (32.7) | (25.5)
Transfers |  | 0.7
Impact of foreign exchange | (1.2) | (2.0)
Property plant and equipment | 57.4 | 73.1
Accumulated depreciation and amortization [member] | Office equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 45.6 | 45.1
Current year depreciation | 7.6 | 8.4
Disposals | (25.4) | (5.2)
Impact of foreign exchange | (0.2) | (2.7)
Property plant and equipment | 27.6 | 45.6
Accumulated depreciation and amortization [member] | Leasehold improvements [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 64.9 | 61.2
Current year depreciation | 26.7 | 22.2
Disposals | (15.9) | (17.5)
Transfers |  | (0.1)
Impact of foreign exchange | (1.6) | (0.9)
Property plant and equipment | 74.1 | 64.9
Accumulated depreciation and amortization [member] | Assets under finance leases [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 0.1 | 0.9
Current year depreciation |  | 0.2
Disposals | (0.1) | (0.3)
Transfers |  | (0.6)
Impact of foreign exchange |  | (0.1)
Property plant and equipment |  | 0.1
Accumulated depreciation and amortization [member] | Other [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property plant and equipment | 17.2 | 16.9
Current year depreciation | 2.1 | 2.8
Disposals | (2.6) | (3.1)
Impact of foreign exchange | (0.7) | 0.6
Property plant and equipment | CAD 16.0 | CAD 17.2

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment 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: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_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 a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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