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INCOME TAXES. (Deferred Income Taxes (Benefits)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Property and equipment | $ 15.6 | $ 3.0 | $ 11.0
Asset impairments | 2.9 | (2.4) | 0.9
Stock-based compensation | 1.8 | 4.5 | 7.1
Accrued compensation | (2.2) | 1.3 | (2.2)
Supplemental savings plan liability | (43.3) | (33.6) | (17.4)
Unrealized holding gains recognized in non-operating income | 46.8 | 63.0 | (32.0)
Other | (7.9) | (2.5) | (2.9)
Total deferred income taxes (benefits) | $ 13.7 | $ 33.3 | $ (35.5)

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