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Cash Flow Information - Reconciliation of Liabilities Arising from Financing Activities (Detail)
CAD in Millions
 12 Months Ended
Dec. 31, 2017
CAD
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance CAD 906.1
Statement of Cash Flows, Proceeds 259.4
Statement of Cash Flows, Repayments or Payments (530.6)
Non-cash Changes, Other 58.2
Ending balance 693.1
Finance lease obligations [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 23.1
Statement of Cash Flows, Repayments or Payments (12.7)
Non-cash Changes, Foreign Exchange (0.1)
Non-cash Changes, Other 0.1
Ending balance 10.4
Dividends to shareholders [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 12.8
Statement of Cash Flows, Repayments or Payments (55.5)
Non-cash Changes, Other 57.0
Ending balance 14.3
Revolving credit facilities [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 416.1
Statement of Cash Flows, Proceeds 259.4
Statement of Cash Flows, Repayments or Payments (462.4)
Non-cash Changes, Foreign Exchange (3.2)
Ending balance 209.9
Term loan [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 454.1
Non-cash Changes, Foreign Exchange 3.3
Non-cash Changes, Other 1.1
Ending balance CAD 458.5