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Share-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 6.6 $ 6.1 $ 21.4 $ 21.0
Consideration received from share-based awards     $ 42.9 $ 7.2
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options [Line Items]        
Net earnings per share - diluted (in dollars per share) $ 2.04 $ 1.87 $ 4.84 $ 4.42
ASU 2016-09        
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options [Line Items]        
Income tax benefit related to share-based compensation awards $ 1.1   $ 5.5  
Net earnings per share - diluted (in dollars per share) $ 0.02   $ 0.08