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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net earnings available to common shareholders $ 123.9 $ 130.5 $ 295.3 $ 310.4
Weighted-average common shares outstanding (in millions)        
Weighted-average common shares outstanding - basic (in shares) 76.1 79.7 77.7 79.8
Effect of dilutive securities - stock options (in shares) 0.4 0.6 0.5 0.7
Effect of other share-based awards (in shares) 0.5 0.8 0.5 0.8
Weighted-average common shares outstanding - diluted (in shares) 77.0 81.1 78.7 81.3
Net earnings per share - basic (in dollars per share) $ 1.63 $ 1.64 $ 3.80 $ 3.89
Net earnings per share - diluted (in dollars per share) $ 1.61 $ 1.61 $ 3.75 $ 3.82
Share-based awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share - Diluted [Line Items]        
Antidilutive securities excluded from the calculation of net earnings per share - diluted (in shares) 0.2 0.1 0.3 0.2