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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
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]            
Net earnings (loss) available to common shareholders $ 65.2 $ 77.8 $ 122.2 $ 91.6 $ 143.0 $ 213.8
Weighted-average common shares outstanding (in millions)            
Weighted-average common shares outstanding - basic 50.2   52.7   50.4 53.2
Weighted-average common shares outstanding - diluted 50.7   53.4   51.0 53.8
Net earnings (loss) per share - basic $ 1.3   $ 2.32   $ 2.84 $ 4.02
Net earnings (loss) per share - diluted $ 1.29   $ 2.29   $ 2.8 $ 3.97
Employee Stock Option            
Weighted-average common shares outstanding (in millions)            
Effect of dilutive securities 0.0   0.1   0.0 0.0
Effect of other share-based awards            
Weighted-average common shares outstanding (in millions)            
Effect of dilutive securities 0.5   0.6   0.6 0.6