INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of period	$ 12.1	$ 21.9	$ 18.0
Gross change for prior period positions	(2.0)	(7.6)	5.1
Gross change for current year positions	2.2	0.2	0.2
Decrease due to settlements and payments	(1.3)	(0.5)	(0.2)
Decrease due to statute expirations	0.0	(0.2)	(0.6)
Increase due to effect of foreign currency translation	0.0	0.0	0.0
Decrease due to effect from foreign currency translation	(0.2)	(1.7)	(0.6)
Unrecognized tax benefits at end of period	$ 10.8	$ 12.1	$ 21.9