Share-Based Compensation - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Awards granted
Share-based compensation expense (benefit) before taxes	$ 25.6	$ (12.4)
Unrecognized compensation cost	$ 75.9
Stock Options with Performance Conditions
Awards granted
Granted (in shares)	500,000	400,000
Share-based compensation expense (benefit) before taxes	$ 4.8	$ 0.2
Total grant date fair value	50.2	35.6
Aggregate grant date fair value	$ 50.2	35.6
Stock options
Awards granted
Granted (in shares)	534,277
Share-based compensation expense (benefit) before taxes	$ 5.7	$ 4.9
Weighted average grant date fair value of stock options (in dollars per share)	$ 97.18	$ 85.52
Total grant date fair value	$ 51.9	$ 36.3
Aggregate grant date fair value	51.9	36.3
Total grant date fair value of employee stock options that vested	$ 0.9	$ 52.9
Weighted average remaining vesting period	2 years 7 months 6 days