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INCOME TAXES. (Deferred Income Taxes (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Property and equipment	$ 15.6	$ 3.0	$ 11.0
Asset impairments	2.9	(2.4)	0.9
Stock-based compensation	1.8	4.5	7.1
Accrued compensation	(2.2)	1.3	(2.2)
Supplemental savings plan liability	(43.3)	(33.6)	(17.4)
Unrealized holding gains recognized in non-operating income	46.8	63.0	(32.0)
Other	(7.9)	(2.5)	(2.9)
Total deferred income taxes (benefits)	$ 13.7	$ 33.3	$ (35.5)

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