Stock Based Compensation Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock-based Payment Award
Stock-based compensation expense		$ 71.2	$ 52.9	$ 55.7
Tax benefit		17.0	12.5	13.1
Stock-settled awards
Stock-based Payment Award
Stock-based compensation expense		36.7	27.8	26.3
Cash-settled awards
Stock-based Payment Award
Stock-based compensation expense		0.8	0.3	0.3
Performance-based awards
Stock-based Payment Award
Stock-based compensation expense		28.1	18.9	23.7
Employee stock purchase plan
Stock-based Payment Award
Stock-based compensation expense		2.6	2.9	3.1
Other
Stock-based Payment Award
Stock-based compensation expense	[1]	3.0	2.7	2.0
Equity Option
Stock-based Payment Award
Stock-based compensation expense		$ 0.0	$ 0.3	$ 0.3

[1] Represents charges recorded for severance expense related to stock-based compensation awards.