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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net earnings available to common shareholders $ 129.2 $ 123.9 $ 316.3 $ 295.3
Weighted-average common shares outstanding (in millions)        
Weighted-average common shares outstanding - basic (in shares) 68.4 76.1 70.9 77.7
Weighted-average common shares outstanding - diluted (in shares) 69.0 77.0 71.6 78.7
Net earnings per share - basic (in dollars per share) $ 1.89 $ 1.63 $ 4.46 $ 3.80
Net earnings per share - diluted (in dollars per share) $ 1.87 $ 1.61 $ 4.42 $ 3.75
Share-Based Awards        
Weighted-average common shares outstanding (in millions)        
Antidilutive securities excluded from the calculation of net earnings per share - diluted (in shares) 0.7 0.2 0.7 0.3
Stock Options        
Weighted-average common shares outstanding (in millions)        
Effect of dilutive securities 0.2 0.4 0.2 0.5
Non-Stock Option Awards        
Weighted-average common shares outstanding (in millions)        
Effect of dilutive securities 0.4 0.5 0.5 0.5