Income Taxes - Schedule of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ 38.1	$ 46.1	$ 45.2
State	9.7	12.8	14.4
Total current	47.8	58.9	59.6
Deferred:
Federal	17.8	16.0	(3.7)
State	2.9	4.4	(1.0)
Total income tax expense	68.5	79.3	54.9
Operating Loss Carryforwards [Line Items]
Deficiency (benefit) of stock-based compensation plans	0.6	0.3	0.2
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	0.0	0.0	2.0
Federal tax credits	(0.3)	(0.2)	(4.3)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	2.5	2.0	1.6
Total deferred	$ 20.7	$ 20.4	$ (4.7)