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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]          
Share-based compensation $ 15.2 $ 21.2 $ 45.0 $ 44.5  
Tax benefit 2.0 $ 3.5 5.6 $ 7.8  
Compensation expense related to share-based compensation $ 76.7   $ 76.7   $ 70.9
Weighted average period over which compensation expense will be recognized     2 years