INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes Uncertain Tax Positions and Tax Reform [Abstract]
Liability for uncertain tax positions	$ 28.2			$ 28.2		$ 30.4
Liability for uncertain tax positions - current	1.1			1.1		2.5
Liability for uncertain tax positions - lapse of statute of limitations				(2.5)
Interest and penalties uncertain tax positions recognized				0.7	$ 0.6
(Benefit) on reversal of interest and penalties	(0.3)	$ 0.0		(0.7)	$ 0.0
Accrued interest and penalties uncertain tax positions	$ 3.1			$ 3.1		$ 3.2
Federal statutory income tax rate				21.00%		35.00%
Estimated deemed repatriation tax				$ (2.6)
One-time transition tax			$ 18.1	$ 15.5