GOODWILL AND INTANGIBLE ASSETS, NET - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - Gross Carrying Amount	$ 83.0	$ 83.3
Definite-lived intangible assets - Accumulated Amortization	(69.8)	(69.5)
Definite-lived intangible assets - Net Carrying Amount	13.2	13.8
Aggregate Amortization Expense	2.0	2.0	$ 2.9
Estimated Aggregate Intangible Asset Amortization Expense
2019	1.8
2020	1.8
2021	1.7
2022	1.4
2023	$ 0.9
Technology
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - Weighted Average Life (in years)	7 years
Definite-lived intangible assets - Gross Carrying Amount	$ 19.7	18.8
Definite-lived intangible assets - Accumulated Amortization	(17.3)	(17.8)
Definite-lived intangible assets - Net Carrying Amount	$ 2.4	1.0
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - Weighted Average Life (in years)	20 years
Definite-lived intangible assets - Gross Carrying Amount	$ 32.6	33.2
Definite-lived intangible assets - Accumulated Amortization	(28.7)	(28.3)
Definite-lived intangible assets - Net Carrying Amount	$ 3.9	4.9
Land Use Rights
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - Weighted Average Life (in years)	81 years
Definite-lived intangible assets - Gross Carrying Amount	$ 4.4	4.8
Definite-lived intangible assets - Accumulated Amortization	(0.6)	(0.6)
Definite-lived intangible assets - Net Carrying Amount	$ 3.8	4.2
Other
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets - Weighted Average Life (in years)	8 years
Definite-lived intangible assets - Gross Carrying Amount	$ 26.3	26.5
Definite-lived intangible assets - Accumulated Amortization	(23.2)	(22.8)
Definite-lived intangible assets - Net Carrying Amount	$ 3.1	$ 3.7