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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]      
Net earnings available to common shareholders $ 382.4 $ 23.8 $ 465.7
Weighted-average common shares outstanding (in millions):      
Weighted-average common shares outstanding - basic (in shares) 54.5 58.0 59.9
Weighted-average common shares outstanding - diluted (in shares) 55.4 58.3 60.3
Net earnings per share - basic $ 7.01 $ 0.41 $ 7.78
Net earnings per share - diluted $ 6.91 $ 0.41 $ 7.72
Effect of dilutive securities - stock options      
Weighted-average common shares outstanding (in millions):      
Effect of dilutive securities 0.2 0.0 0.0
Effect of other share-based awards      
Weighted-average common shares outstanding (in millions):      
Effect of dilutive securities 0.7 0.3 0.4