INCOME TAXES - Significant components of income taxes, continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
U.S.	$ 2.9	$ (14.9)	$ 10.0
Non - U.S.	13.6	16.8	32.9
State	0.0	0.0	0.0
Current expense (benefit)	16.5	1.9	42.9
Deferred:
U.S.	(69.8)	(1.2)	(20.9)
Non - U.S.	1.7	25.9	(17.0)
Deferred provision (benefit)	(68.1)	24.7	(37.9)
Total provision (benefit)	$ (51.6)	$ 26.6	$ 5.0