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Net Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net earnings available to common shareholders $ 105.7 $ 109.8 $ 171.4 $ 179.9
Weighted-average common shares outstanding        
Weighted-average common shares outstanding - basic 78.3 79.9 78.5 79.9
Effect of dilutive securities - stock options 0.6 0.7 0.6 0.7
Effect of other share-based awards 0.4 0.8 0.4 0.8
Weighted-average common shares outstanding - diluted 79.3 81.4 79.5 81.4
Net earnings per share - basic (in dollars per share) $ 1.35 $ 1.37 $ 2.18 $ 2.25
Net earnings per share - diluted (in dollars per share) $ 1.33 $ 1.35 $ 2.16 $ 2.21
Share-based awards [Member]        
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) 0.3 0.2 0.3 0.2