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Net Earnings Per Share - Calculations of Net Earnings Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Net earnings (loss) available to common shareholders | $ 122.2 | $ 91.6 | $ 111.6 | $ 62.0 | $ 213.8 | $ 173.6
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |
Weighted-average common shares outstanding - basic | 52.7 |  | 54.5 |  | 53.2 | 54.8
Weighted-average common shares outstanding - diluted | 53.4 |  | 55.4 |  | 53.8 | 55.5
Net earnings (loss) per share - basic | $ 2.32 |  | $ 2.05 |  | $ 4.02 | $ 3.17
Net earnings (loss) per share - diluted | $ 2.29 |  | $ 2.02 |  | $ 3.97 | $ 3.13
Effect of dilutive securities - stock options |  |  |  |  |  |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |
Effect of dilutive securities | 0.1 |  | 0.2 |  |  | 0.1
Effect of other share-based awards |  |  |  |  |  |
Weighted-average common shares outstanding (in millions) |  |  |  |  |  |
Effect of dilutive securities | 0.6 |  | 0.7 |  | 0.6 | 0.6

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