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Capital Stock - Director SBC Included in the Income Statement (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
SBC expense included in above employee-related costs | $ $ 34.1 $ 33.4 $ 30.1
RSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of shares outstanding (in shares) 4,600,000 3,800,000 3,200,000
Director | DSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
SBC expense included in above employee-related costs | $ $ 2.4 $ 2.0 $ 2.2
Number of shares outstanding (in shares) 1,800,000 1,600,000 1,500,000
Director | RSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of shares outstanding (in shares) 20,000 0 0