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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-Based Compensation Expense $ 44.7 $ 40.4 $ 39.2
Tax Benefit $ 11.2 $ 13.6 $ 15.1