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Income Taxes - Schedule of Reconciliation of Net Deferred Tax Assets (Liabilities) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of deferred income taxes [line items]    
Beginning balance $ (33.1)  
Discontinued operations 0.0 $ (8.6)
Tax effect on other comprehensive (loss) income 4.0 2.0
Impact of foreign exchange 0.8 (2.3)
Other 0.2 (0.1)
Deferred taxes acquired through business combinations (9.6) (0.7)
Tax (expense) recovery during the year recognized in net income (15.1) 1.3
Ending balance (41.3) (33.1)
Previously stated [member]    
Disclosure of deferred income taxes [line items]    
Beginning balance (33.1) (31.4)
Ending balance   (33.1)
Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of deferred income taxes [line items]    
Beginning balance 11.5 6.7
Ending balance   11.5
As Restated [Member]    
Disclosure of deferred income taxes [line items]    
Beginning balance $ (21.6) (24.7)
Ending balance   $ (21.6)