Income Taxes - Reconciliation of Amount Computed by Applying the Federal Statutory Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory tax on earnings before income taxes	$ 127.9	$ 72.1	$ 1.7
State income taxes, net of federal income tax benefit	32.6	15.8	(0.6)
Non-deductible officer's compensation	7.6	6.4	3.5
Valuation allowance - state and foreign net operating losses	2.5	1.8	1.1
Uncertain tax positions	2.3	0.1	1.7
Re-measurement of deferred taxes	1.3	(1.5)	1.9
Windfall deduction from equity compensation	(2.3)	(1.4)	(1.3)
Net operating loss carry back - CARES Act	0.0	0.0	(13.3)
Other	(2.5)	1.2	0.0
Income tax provision (benefit)	$ 169.4	$ 94.5	$ (5.3)