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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net earnings $ 134.2 $ 107.7 $ 397.3 $ 325.9
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0 0.0
Net earnings available to common stockholders $ 134.2 $ 107.7 $ 397.3 $ 325.9
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 145.2 149.9 146.3 151.8
Basic net earnings per common share:        
Basic net earnings per common share (in dollars per share) $ 0.92 $ 0.72 $ 2.72 $ 2.15
Numerator:        
Net earnings available to common stockholders $ 134.2 $ 107.7 $ 397.3 $ 325.9
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 145.2 149.9 146.3 151.8
Effect of unvested restricted stock units (in shares) 1.4 1.5 1.5 1.4
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 146.6 151.4 147.8 153.2
Diluted net earnings per common share (in dollars per share) $ 0.92 $ 0.71 $ 2.69 $ 2.13