Stock Based Compensation Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stock-based Payment Award
Stock-based compensation expense		$ 55.7	$ 84.8	$ 71.1
Tax benefit		13.1	18.0	17.3
Stock-settled awards
Stock-based Payment Award
Stock-based compensation expense		26.3	36.7	38.4
Cash-settled awards
Stock-based Payment Award
Stock-based compensation expense		0.3	1.0	1.0
Performance-based awards
Stock-based Payment Award
Stock-based compensation expense		23.7	33.4	28.6
Employee stock purchase plan
Stock-based Payment Award
Stock-based compensation expense		3.1	2.1	1.4
Other
Stock-based Payment Award
Stock-based compensation expense	[1]	2.0	11.3	1.7
Equity Option
Stock-based Payment Award
Stock-based compensation expense		$ 0.3	$ 0.3	$ 0.0

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