Summary of Significant Accounting Policies (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Additional paid-in capital	$ 3,004.2		$ 3,004.2		$ 3,051.6
Long-term debt, net	1,065.9		1,065.9		1,025.3
Deferred taxes, net	(107.0)		(107.0)		(163.6)
Retained earnings	925.2		925.2		682.2
Interest expense	$ 1.6	$ 0.0	$ 4.8	$ 0.0
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Additional paid-in capital					57.1
Long-term debt, net					57.9
Deferred taxes, net					13.2
Retained earnings					$ 12.4
Common stock, shares, outstanding (in shares)					14.7