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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]          
Share-based compensation $ 15.7 $ 11.7 $ 46.4 $ 30.7  
Tax benefit 2.9 $ 2.0 8.4 $ 6.7  
Compensation expense related to share-based compensation $ 88.8   $ 88.8   $ 106.6
Weighted average period over which compensation expense will be recognized     3 years