INCOME TAXES - (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current federal	$ 0.7	$ 0.1	$ 3.1
Current state	1.1	1.2	0.8
Current foreign	10.7	3.8	4.1
Total current	12.5	5.1	8.0
Deferred federal	(12.6)	0.0	0.2
Deferred state	(3.6)	1.1	(0.2)
Deferred foreign	(1.6)	3.0	4.3
Total deferred	(17.8)	4.1	4.3
Income tax	(5.3)	9.2	12.3
Tax benefit (expense) from discontinued operations	$ 3.7	$ (0.8)	$ 2.1