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Share Capital - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CAD ($) day shares | Dec. 31, 2019 CAD ($) shares | Nov. 12, 2020 shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Common shares repurchased for cancellation (in shares) | shares | 2,047,948 | 1,400,713 |
Cost of common shares repurchased and cancelled | $ 78.3 | $ 43.2 |
Reduction in share capital | 16.8 | 10.9 |
Reduction in contributed surplus accounts | 0.4 | 0.3 |
Charges to retained earnings | (61.1) | (32.0) |
Dividends declared included in trade and other payables | 17.2 | 16.1 |
Share-based compensation expense | 16.4 | 18.1 |
Expense related to fair value of options granted | 1.0 | 3.4 |
Expense related to amortization of fair value of options granted | 15.4 | 14.7 |
Adjustments for share-based payments | 0.9 |  |
Outstanding fair value | $ 25.5 | $ 23.0 |
Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Maximum common shares authorized to be repurchased (in shares) | shares |  |  | 5,605,224
RSUs |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share units granted | 142,043 | 166,963 |
Outstanding fair value | $ 4.2 | $ 1.1 |
Number of DSUs paid | 0 | 0 |
PSUs |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share units granted | 320,256 | 379,289 |
Vesting period for share-based payment arrangement | 3 years |  |
Outstanding fair value | $ 14.3 | $ 11.1 |
Number of DSUs paid | 234,966 | 198,815 |
PSUs | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighting of the return on equity target |  | 40.00% |
PSUs | Bottom of range | Option pricing model |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of units vest percentage | 0.00% |  |
PSUs | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighting of the return on equity target |  | 60.00% |
PSUs | Top of range | Option pricing model |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of units vest percentage | 200.00% |  |
PSUs, excluding dividends |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share units granted | 308,136 | 378,049 |
Fair value of share units granted | $ 16.4 | $ 11.6 |
DSUs |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share units granted | 37,147 | 44,806 |
Number of DSUs paid | 149,848 | 75,315 |
Amount of DSUs paid | $ 6.1 | $ 2.4 |
Fair value of outstanding and vested DSUs | $ 6.7 | $ 10.2 |
DSUs, excluding dividends |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share units granted | 37,147 | 44,772 |
Fair value of share units granted | $ 1.4 | $ 1.2 |
DSUs conversion rate to common share | 1 |  |
Number of trading days | day | 10 |  |
Officers and employees | RSUs |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of share units granted | 138,148 |  |
Fair value of share units granted | $ 5.8 |  |
Vesting period for share-based payment arrangement | 3 years |  |

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