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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, 2024
Mar. 31, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net earnings available to common shareholders $ 39.7 $ 77.8
Weighted-average common shares outstanding (in millions)    
Weighted average shares - basic 48.3 50.9
Weighted-average common shares outstanding - diluted 48.9 51.6
Net earnings per share - basic $ 0.82 $ 1.53
Net earnings per share - diluted $ 0.81 $ 1.51
Effect of dilutive securities - share-based awards    
Weighted-average common shares outstanding (in millions)    
Effect of dilutive securities 0.6 0.7