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Provisions - Summary of Provisions (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | $ 96.2 | $ 105.4
Current year provisions | 58.0 | 26.9
Acquisitions | 1.4 | 0.2
Paid or otherwise settled | (40.5) | (30.7)
Impact of foreign exchange | 5.5 | (5.6)
Provisions, end of the year | 120.6 | 96.2
Less current portion | 42.4 | 28.1
Long-term portion | 78.2 | 68.1
Self-insured liabilities provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | 72.5 | 69.4
Current year provisions | 25.1 | 23.9
Paid or otherwise settled | (24.9) | (17.5)
Impact of foreign exchange | 4.3 | (3.3)
Provisions, end of the year | 77.0 | 72.5
Less current portion | 3.8 | 6.6
Long-term portion | 73.2 | 65.9
Claims provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | 18.9 | 25.2
Current year provisions | 4.0 | 2.3
Acquisitions | 0.8 | 0.2
Paid or otherwise settled | (9.8) | (6.8)
Impact of foreign exchange | 0.9 | (2.0)
Provisions, end of the year | 14.8 | 18.9
Less current portion | 11.3 | 18.8
Long-term portion | 3.5 | 0.1
Onerous contracts provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | 4.8 | 10.8
Current year provisions | 13.3 | 0.7
Acquisitions | 0.6 |
Paid or otherwise settled | (5.8) | (6.4)
Impact of foreign exchange | 0.3 | (0.3)
Provisions, end of the year | 13.2 | 4.8
Less current portion | 11.7 | 2.7
Long-term portion | 1.5 | $ 2.1
Expected project loss [member] |  |
Disclosure of other provisions [Line Items] |  |
Current year provisions | 15.6 |
Provisions, end of the year | 15.6 |
Less current portion | $ 15.6 |

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of current provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_c&doctype=Standard -URIDate 2018-03-16 + Details
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