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Cash Flow Information - Reconciliation of Liabilities Arising from Financing Activities (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance $ 693.1
Statement of Cash Flows, Proceeds 432.3
Statement of Cash Flows, Repayments or Payments (346.1)
Non-cash Changes, Foreign Exchange 7.8
Non-cash Changes, Other 85.2
Ending balance 872.3
Finance lease obligations [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 10.4
Statement of Cash Flows, Repayments or Payments (14.8)
Non-cash Changes, Foreign Exchange 1.4
Non-cash Changes, Other 22.5
Ending balance 19.5
Dividends to shareholders [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 14.3
Statement of Cash Flows, Repayments or Payments (61.3)
Non-cash Changes, Other 62.4
Ending balance 15.4
Revolving credit facilities [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 209.9
Statement of Cash Flows, Proceeds 432.3
Statement of Cash Flows, Repayments or Payments (120.0)
Non-cash Changes, Foreign Exchange 6.4
Ending balance 528.6
Term loan [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Beginning balance 458.5
Statement of Cash Flows, Repayments or Payments (150.0)
Non-cash Changes, Other 0.3
Ending balance $ 308.8