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INCOME TAXES - Deferred Income Taxes (Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Property and equipment	$ 11.8	$ 15.6	$ 3.0
Asset impairments	2.0	2.9	(2.4)
Stock-based compensation	(8.1)	1.8	4.5
Accrued compensation	(1.6)	(2.2)	1.3
Supplemental savings plan liability	(29.3)	(43.3)	(33.6)
Unrealized holding gains recognized in non-operating income	(26.1)	46.8	63.0
Other	(5.0)	(7.9)	(2.5)
Total deferred income taxes (benefits)	$ (56.3)	$ 13.7	$ 33.3

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