INCOME TAXES - Income (Loss) Before Income Taxes and Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (loss) before income taxes:
United States	$ 78.8	$ 97.3	$ 95.8
Foreign	6.7	(25.5)	(59.2)
Income before income taxes	85.5	71.8	36.6
Current:
United States	(18.1)	33.4	23.5
Foreign	35.6	18.5	9.9
Total current	17.5	51.9	33.4
Deferred and other:
United States	6.4	0.3	(30.3)
Foreign	5.0	9.1	(0.5)
Total deferred and other	11.4	9.4	(30.8)
Total provision	$ 28.9	$ 61.3	$ 2.6