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INCOME TAXES. (Deferred Income Taxes (Tax Benefits)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Property and equipment | $ 3.0 | $ 11.0 | $ (3.9)
Operating lease assets | (33.9) |  |
Operating lease liabilities | 33.9 |  |
Stock-based compensation | 4.5 | 7.1 | 72.4
Accrued compensation | 1.3 | (2.2) | 1.2
Supplemental savings plan liability | (33.6) | (17.4) | (8.3)
Asset impairments | (2.4) | 0.9 | 7.3
Unrealized holding gains recognized in non-operating income | 63.0 | (32.0) | 10.7
Other | (2.5) | (2.9) | (7.7)
Total deferred income taxes (benefits) | $ 33.3 | $ (35.5) | $ 71.7

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