INCOME TAXES - Reconciliation of Income Tax Expense due to the U.S. Federal Statutory Corporate Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision at the U.S. federal statutory rate	$ 206.9	$ 168.1	$ 79.9
Increase (decrease) resulting from:
State income tax, net of benefit for federal deduction	22.3	15.3	5.8
Foreign income tax rate differential	(2.3)	(1.0)	0.0
Change in enacted tax rate — U.K.	0.0	(1.9)	0.0
Tax Credits	(0.4)	(0.8)	(0.3)
Changes in valuation allowances	(2.1)	(2.9)	(0.7)
Stock-based compensation	(1.6)	(2.2)	(0.8)
Uncertain tax benefits	0.0	0.0	(0.3)
Deferred state tax effect	4.3	0.0	0.0
Other	4.0	0.9	0.6
Provision for income taxes	$ 231.1	$ 175.5	$ 84.2