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Share-Based Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation expense $ 6.7 $ 6.6 $ 19.5 $ 21.4
Consideration received from share-based awards     $ 4.7 $ 42.9