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Financial Instruments - Summary of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Trade and other payables | CAD 704.6 | CAD 718.1
Long-term debt | 740.8 | 1,023.0
Other financial liabilities | 10.9 | 10.0
Total contractual obligations | 1,456.3 | 1,751.1
Within one year [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Trade and other payables | 704.6 | 718.1
Long-term debt | 198.4 | 92.4
Other financial liabilities | 1.8 | 2.4
Total contractual obligations | 904.8 | 812.9
Later than one year and not later than three years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Long-term debt | 541.4 | 929.5
Other financial liabilities | 7.5 | 7.6
Total contractual obligations | 548.9 | 937.1
After 3 years [member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Long-term debt | 1.0 | 1.1
Other financial liabilities | 1.6 |
Total contractual obligations | CAD 2.6 | CAD 1.1

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- Definition The amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 39 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_39_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2019-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph IG31A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph B11D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B11D&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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