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INCOME TAXES - Deferred Income Taxes (Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Property and equipment	$ (64.0)	$ 11.8	$ 15.6
Asset impairments	4.6	2.0	2.9
Operating lease assets	24.7	(10.6)	1.0
Operating lease liabilities	(24.2)	10.6	(1.0)
Stock-based compensation	(8.7)	(8.1)	1.8
Accrued compensation	(0.5)	(1.6)	(2.2)
Supplemental savings plan liability	21.3	(29.3)	(43.3)
Acquisition-related retention liability	(13.6)	0.0	0.0
Contingent consideration liability	32.4	0.0	0.0
Acquired investments	(73.0)	0.0	0.0
Unrealized holding gains recognized in non-operating income	(114.6)	(26.1)	46.8
Other	8.6	(5.0)	(7.9)
Total deferred income taxes (benefits)	$ (207.0)	$ (56.3)	$ 13.7

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