INCOME TAXES - Other Tax Matters (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax provision (benefit)			$ 28.9	$ 61.3	$ 2.6
Income before income taxes			$ 85.5	$ 71.8	$ 36.6
Effective income tax rate			33.80%	85.40%	7.10%
Income tax charge, addition of valuation allowance			$ 6.9
Tax benefit resulting from the write-off of tax benefits not expected to be realized	$ 2.0		3.1
Income tax charge due to outbound transfer of an affiliate to non-U.S. entities			6.0
Income tax charge due to outside basis difference			1.8
Income tax charge due to net impact of cancellation of certain intercompany indebtedness			3.9
Transition tax on accumulated foreign earnings, tax cuts and jobs act of 2017		$ 19.6	22.2	$ 50.4
Charges related to pre-tax losses		$ 7.7	$ 9.0	10.4
Change in enacted tax rate				$ 71.2