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Share-Based Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 8.1 $ 13.1 $ 14.8 $ 23.9
Consideration received from share-based awards     $ 29.1 $ 18.9