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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]          
Share-based compensation $ 22.5 $ 10.2 $ 30.7 $ 19.0  
Tax benefit 4.1 $ 2.5 5.6 $ 4.7  
Compensation expense related to share-based compensation $ 101.7   $ 101.7   $ 106.6
Weighted average period over which compensation expense will be recognized     3 years