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Provisions - Summary of Provisions for Self-Insured Liabilities, Claims and Onerous Contracts (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Self-insured liabilities provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | CAD 69.4 | CAD 61.5
Current-year provisions | 23.9 | 10.5
Resulting from acquisitions |  | 8.0
Costs paid or otherwise settled | (17.5) | (9.6)
Impact of foreign exchange | (3.3) | (1.0)
Provision, end of the year | 72.5 | 69.4
Claims provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | 25.2 | 13.3
Current-year provisions | 2.3 | 2.3
Resulting from acquisitions | 0.2 | 23.6
Costs paid or otherwise settled | (6.8) | (11.3)
Impact of foreign exchange | (2.0) | (2.7)
Provision, end of the year | 18.9 | 25.2
Onerous contracts provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Provision, beginning of the year | 10.8 | 10.7
Current-year provisions | 0.7 | 4.3
Resulting from acquisitions |  | 2.5
Costs paid or otherwise settled | (6.4) | (6.6)
Impact of foreign exchange | (0.3) | (0.1)
Provision, end of the year | CAD 4.8 | CAD 10.8

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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 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised for new other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_b&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_c&doctype=Standard -URIDate 2017-03-09 + Details
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