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Capital Stock - Schedule of Information about RSUs and PSUs Granted and Outstanding (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Accrual for repurchase of stock under automatic share purchase plan | $ | $ 15.0 |  |
RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares granted (in shares) | 2.4 | 3.0 | 2.6
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in usd per share) | $ / shares | $ 8.60 | $ 7.88 | $ 10.48
Number of shares outstanding (in shares) | 4.5 | 4.6 | 3.8
PSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares granted (in shares) | 1.7 | 2.1 | 1.6
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in usd per share) | $ / shares | $ 9.88 | $ 8.14 | $ 11.11
Number of shares outstanding (in shares) | 4.6 | 3.8 | 3.2

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