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Share Capital - Additional Information (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 CAD ($) day $ / shares shares | Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 | Nov. 09, 2021 shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Common shares repurchased for cancellation (in shares) | shares | 1,085,676 | 939,482 |  |
Cost of common shares repurchased and cancelled | $ 65.3 | $ 50.7 |  |
Reduction in share capital | 9.6 | 8.1 |  |
Reduction in contributed surplus accounts | 0.1 | 0.1 |  |
Charges to retained earnings | 55.6 | 42.5 |  |
Dividends declared included in trade and other payables | 20.0 | 18.3 |  |
Share-based compensation expense | 26.0 | 46.7 |  |
Expense related to fair value of options granted | 0.0 | 0.1 |  |
Expense related to amortization of fair value of options granted | 26.0 | 46.6 |  |
Decrease (increase) through tax on share-based payment transactions, equity | 0.8 | 4.9 |  |
Outstanding fair value | $ 60.4 | $ 62.0 |  |
Bottom of range |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of exercise prices per share (in cad per share) | $ / shares | $ 32.98 |  |  |
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 |  |  |  | 5,538,309
RSUs |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Vesting period for share-based payment arrangement |  | 3 years |  |
Number of trading days | day | 5 |  |  |
Number of share units granted | 150,591 | 128,579 |  |
Number of units paid | 148,327 | 0 |  |
Payments made for RSUs | $ 8.0 | $ 0.0 |  |
Outstanding fair value | $ 12.7 | $ 15.4 |  |
PSUs |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Vesting period for share-based payment arrangement | 3 years |  |  |
Number of trading days | day | 5 |  |  |
Number of share units granted | 263,434 | 251,120 |  |
Number of units paid | 318,058 | 235,373 |  |
Outstanding fair value | $ 32.8 | $ 32.5 |  |
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 | 253,938 | 242,701 |  |
Fair value of share units granted | $ 14.5 | $ 14.0 |  |
Number of units paid | 318,058 | 235,373 |  |
Amount of units paid | $ 15.3 | $ 9.0 |  |
DSUs, excluding dividends |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Percentage of compensation | 70.00% |  |  |
Number of trading days | day | 10 |  |  |
Number of share units granted | 28,871 | 37,162 |  |
Fair value of share units granted | $ 1.6 | $ 1.8 |  |
DSUs |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Number of share units granted | 28,871 | 37,162 |  |
Number of units paid | 0 | 0 |  |
Fair value of outstanding and vested DSUs | $ 14.9 | $ 14.1 |  |
Officers and employees | RSUs |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Number of share units granted | 145,884 | 124,599 |  |
Fair value of share units granted | $ 8.0 | $ 6.7 |  |

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