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Share-Based Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 8.1 $ 10.4 $ 22.9 $ 34.3
Consideration received from share-based awards     $ 65.8 $ 24.3