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Cash Flow Information - Schedule of Cash Flows from Operating Activities Determined by Indirect Method (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES    
Net income for the year CAD 97.0 CAD 130.5
Add (deduct) items not affecting cash:    
Depreciation of property and equipment 54.6 51.2
Amortization of intangible assets 80.2 75.7
Deferred income taxes (26.4) 12.6
Loss (gain) on sale of property and equipment 0.2 1.5
Realized gain on available-for-sale equity securities (9.6)  
Gain on sale of a subsidiary (54.6)  
Share-based compensation 9.5 8.9
Provision for self-insured liabilities and claims 26.2 12.8
Share of income from joint ventures and associates (2.6) (2.4)
Other non-cash items 5.0 (2.6)
Adjustment For Reconcile Profit and Loss 179.5 288.2
Trade and other receivables 70.7 32.8
Unbilled revenue 58.9 1.9
Prepaid expenses 15.9 (1.5)
Income taxes recoverable 143.7 (4.8)
Trade and other payables (172.8) 1.7
Deferred revenue (32.2) (32.6)
Cash flows from used in operations 84.2 (2.5)
Cash flows from operating activities CAD 263.7 CAD 285.7