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Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:        
Net earnings $ 56.6 $ 134.2 $ 217.6 $ 397.3
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0 0.0
Net earnings available to common stockholders $ 56.6 $ 134.2 $ 217.6 $ 397.3
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 144.5 145.2 144.3 146.3
Basic net earnings per common share:        
Basic net earnings per common share (in dollars per share) $ 0.39 $ 0.92 $ 1.51 $ 2.72
Numerator:        
Net earnings available to common stockholders $ 56.6 $ 134.2 $ 217.6 $ 397.3
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 144.5 145.2 144.3 146.3
Effect of unvested restricted stock units (in shares) 0.4 1.4 0.5 1.5
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 144.9 146.6 144.8 147.8
Diluted net earnings per common share (in dollars per share) $ 0.39 $ 0.92 $ 1.50 $ 2.69