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Capital Stock - Schedule of Capital Transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number Of Shares Outstanding [Roll Forward]      
Proceeds from exercise of options $ 0.0 $ 0.4 $ 13.6
SVS      
Number Of Shares Outstanding [Roll Forward]      
Number of shares issued, beginning balance (in shares) 117,700,000 123,200,000 121,900,000
Number of shares outstanding, beginning balance (in shares) 117,700,000 123,200,000 121,900,000
Issued from treasury (in shares) 800,000 1,300,000 2,800,000
Cancelled under NCIB (in shares) (8,300,000) (6,800,000) (1,900,000)
Other (in shares) 0 0 346,175
Number of shares issued, ending balance (in shares) 110,200,000 117,700,000 123,200,000
Number of shares outstanding, ending balance (in shares) 1,102,000,000 117,700,000 123,200,000
MVS      
Number Of Shares Outstanding [Roll Forward]      
Number of shares issued, beginning balance (in shares) 18,600,000 18,600,000 18,900,000
Number of shares outstanding, beginning balance (in shares) 18,600,000 18,600,000 18,900,000
Issued from treasury (in shares) 0 0 0
Cancelled under NCIB (in shares) 0 0 0
Other (in shares)     (350,000)
Number of shares issued, ending balance (in shares) 18,600,000 18,600,000 18,600,000
Number of shares outstanding, ending balance (in shares) 18,600,000 18,600,000 18,600,000
Options | SVS      
Number Of Shares Outstanding [Roll Forward]      
Shares issued (in shares) 0 100,000 1,700,000
RSUs | SVS      
Number Of Shares Outstanding [Roll Forward]      
Shares issued (in shares) 800,000 1,200,000 1,100,000
Value of shares issued upon vesting of RSUs $ 10.4 $ 14.3 $ 9.8