INCOME TAXES (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized tax benefits [Roll forward]
Balance at January 1		$ 50.9	$ 67.4	$ 20.7
Additions resulting from current year tax positions		0.2	8.0	1.3
Additions relating to tax positions taken in prior years		4.5	2.6	51.7
Reductions due to settlements		0.0	(25.0)	(4.5)
Reductions due to cash payments		(7.5)	0.0	0.0
Reductions relating to tax positions taken in prior years		(0.4)	(0.3)	(1.4)
Reductions due to expiration of tax years	$ (0.3)	(0.3)	(1.8)	(0.4)
Balance at December 31	$ 47.4	$ 47.4	$ 50.9	$ 67.4