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Capital Stock - Director SBC Included in the Income Statement (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 26, 2020 | Dec. 31, 2020 USD ($) shares $ / shares | Dec. 31, 2019 USD ($) shares $ / shares | Dec. 31, 2018 USD ($) shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
SBC expense included in above employee-related costs | $ |  | $ 25.8 | $ 34.1 | $ 33.4
RSUs |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of shares granted (in shares) |  | 2,400,000 | 3,000,000.0 | 2,600,000
Number of shares outstanding (in shares) |  | 4,500,000 | 4,600,000 | 3,800,000
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 granted (in shares) |  | 2,400,000 | 3,000,000.0 | 2,600,000
Director | DSUs |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
SBC expense included in above employee-related costs | $ |  | $ 2.0 | $ 2.4 | $ 2.0
Number of shares granted (in shares) |  | 200,000 | 200,000 | 200,000
Number of shares outstanding (in shares) |  | 2,000,000.0 | 1,800,000 | 1,600,000
Weighted average exercise price of other equity instruments granted in share-based payment arrangement (in usd per share) | $ / shares |  | $ 5.64 | $ 7.62 | $ 10.33
Number of shares granted (in shares) |  | 200,000 | 200,000 | 200,000
Director | RSUs |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of shares outstanding (in shares) |  | 30,000.00 | 20,000.00 | 0
Mr. William A. Etherington | DSUs | Other related parties | Retirement of the chairman of the board of directors |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Award requisite service period | 90 days |  |  |

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