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Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net earnings $ 113.9 $ 108.1 $ 263.1 $ 218.2
Distributed and allocated undistributed net earnings to unvested restricted stockholders 0.0 0.0 0.0 0.0
Net earnings available to common stockholders $ 113.9 $ 108.1 $ 263.1 $ 218.2
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 146.0 151.4 146.8 152.8
Basic net earnings per common share:        
Basic net earnings per common share (in dollars per share) $ 0.78 $ 0.71 $ 1.79 $ 1.43
Numerator:        
Net earnings available to common stockholders $ 113.9 $ 108.1 $ 263.1 $ 218.2
Denominator:        
Weighted average number of common shares outstanding - basic (in shares) 146.0 151.4 146.8 152.8
Effect of unvested restricted stock units (in shares) 1.5 1.3 1.7 1.2
Weighted average number of common shares outstanding - diluted under treasury stock (in shares) 147.5 152.7 148.5 154.0
Diluted net earnings per common share (in dollars per share) $ 0.77 $ 0.71 $ 1.77 $ 1.42