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INCOME TAXES - Deferred Income Taxes (Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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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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