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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net earnings available to common shareholders $ 127.3 $ 143.4 $ 180.8 $ 240.4
Weighted-average common shares outstanding (in millions)        
Weighted-average common shares outstanding - basic (in shares) 60.0 65.7 60.3 65.8
Weighted-average common shares outstanding - diluted (in shares) 60.4 66.1 60.7 66.4
Net earnings per share - basic (in dollars per share) $ 2.12 $ 2.18 $ 3.00 $ 3.65
Net earnings per share - diluted (in dollars per share) $ 2.11 $ 2.17 $ 2.98 $ 3.62
Effect of dilutive securities - stock options        
Weighted-average common shares outstanding (in millions)        
Effect of dilutive securities 0.1 0.1 0.1 0.2
Effect of other share-based awards        
Weighted-average common shares outstanding (in millions)        
Effect of dilutive securities 0.3 0.3 0.3 0.4