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Capital Stock - Director SBC Included in the Income Statement (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) shares $ / shares | Dec. 31, 2020 USD ($) shares $ / shares | Dec. 31, 2019 USD ($) shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
SBC expense included in above employee-related costs | $ | $ 33.4 | $ 25.8 | $ 34.1
RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares granted (in shares) | 3,000,000.0 | 2,400,000 | 3,000,000.0
Number of shares outstanding (in shares) | 4,600,000 | 4,500,000 | 4,600,000
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in usd per share) | $ / shares | $ 8.36 | $ 8.60 | $ 7.88
Director | DSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
SBC expense included in above employee-related costs | $ | $ 2.1 | $ 2.0 | $ 2.4
Number of shares granted (in shares) | 120,000 | 200,000 | 200,000
Number of shares outstanding (in shares) | 2,200,000 | 2,000,000.0 | 1,800,000
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in usd per share) | $ / shares | $ 8.98 | $ 5.64 | $ 7.62
Director | RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of shares granted (in shares) | 54,000.000 | 22,000.000 | 16,000.000
Number of shares outstanding (in shares) | 70,000.00 | 30,000.00 | 20,000.00
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in usd per share) | $ / shares | $ 8.92 | $ 5.71 | $ 7.62

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