Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
U.S. Federal	$ 8.2	$ 6.9	$ (3.2)
Foreign	0.8	0.3	0.2
State	3.6	2.7	1.0
Total current	12.6	9.9	(2.0)
Deferred
U.S. Federal	1.3	5.1	9.7
Foreign	(0.5)		0.1
State	0.6	2.5	2.7
Total deferred	1.4	7.6	12.5
Income tax expense (benefit)	$ 14.0	$ 17.5	$ 10.5