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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net earnings available to common shareholders $ 97.0 $ 74.4
Weighted-average common shares outstanding (in millions)    
Weighted-average common shares outstanding - basic (in shares) 66.3 67.7
Weighted-average common shares outstanding - diluted (in shares) 66.9 68.4
Net earnings per share - basic (in dollars per share) $ 1.46 $ 1.10
Net earnings per share - diluted (in dollars per share) $ 1.45 $ 1.09
Share-based awards    
Weighted-average common shares outstanding (in millions)    
Antidilutive securities excluded from the calculation of net earnings per share - diluted (in shares) 0.1 0.1
Stock Options    
Weighted-average common shares outstanding (in millions)    
Effect of dilutive securities (in shares) 0.2 0.2
Non-Stock Option Awards    
Weighted-average common shares outstanding (in millions)    
Effect of dilutive securities (in shares) 0.4 0.5