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INCOME TAXES. (Deferred Income Taxes (Tax Benefits)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Property and equipment | $ (3.9) | $ 3.2 | $ (2.3)
Stock-based compensation | 72.4 | 1.3 | (14.6)
Accrued compensation | 1.2 | (1.7) | (0.9)
Supplemental savings plan liability | (8.3) | (30.9) | (27.4)
Other-than-temporary impairments of available-for-sale investments | 7.3 | 10.0 | (0.4)
Unrealized holding gains recognized in non-operating income | 10.7 | 31.6 | (2.4)
Other | (7.7) | 0.0 | 4.7
Total deferred income taxes (tax benefits) | $ 71.7 | $ 13.5 | $ (43.3)

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