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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Provision at the U.S. federal statutory rate	$ 168.0	$ 206.9	$ 168.1
Increase (decrease) resulting from:
State income tax, net of benefit for federal deduction	25.2	22.3	15.3
Foreign income tax rate differential	0.6	(2.3)	(1.0)
Change in enacted tax rate — U.K.	0.0	0.0	(1.9)
Tax credits	(0.5)	(0.4)	(0.8)
Change in valuation allowance	(2.6)	(2.1)	(2.9)
Stock-based compensation	(3.6)	(1.6)	(2.2)
Deferred state tax effect	(1.1)	4.3	0.0
Gain on dispositions	5.5	0.0	0.0
Other	6.7	4.0	0.9
Provision for income taxes	$ 198.2	$ 231.1	$ 175.5

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