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INCOME TAXES. (Deferred Income Taxes (Tax Benefits)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Property and equipment | $ 11.0 | $ (3.9) | $ 3.2
Stock-based compensation | 7.1 | 72.4 | 1.3
Accrued compensation | (2.2) | 1.2 | (1.7)
Supplemental savings plan liability | (17.4) | (8.3) | (30.9)
Asset impairments | 0.9 | 7.3 | 10.0
Unrealized holding gains recognized in non-operating income | (32.0) | 10.7 | 31.6
Other | (2.9) | (7.7) | 0.0
Total deferred income taxes (benefits) | $ (35.5) | $ 71.7 | $ 13.5

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