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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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