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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
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net earnings (loss) available to common shareholders $ 77.8 $ 91.6
Weighted-average common shares outstanding (in millions)    
Weighted-average common shares outstanding - basic 50.9 53.6
Weighted-average common shares outstanding - diluted 51.6 54.4
Net earnings (loss) per share - basic $ 1.53 $ 1.71
Net earnings (loss) per share - diluted $ 1.51 $ 1.68
Effect of dilutive securities - stock options    
Weighted-average common shares outstanding (in millions)    
Effect of dilutive securities 0.1 0.1
Effect of other share-based awards    
Weighted-average common shares outstanding (in millions)    
Effect of dilutive securities 0.6 0.7