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