The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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GOODWILL AND INTANGIBLE ASSETS, NET GOODWILL AND INTANGIBLE ASSETS, NET - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Definite-lived intangible assets:
Gross Carrying Amount	$ 64.3		$ 64.3		$ 64.4
Accumulated Amortization	(55.5)		(55.5)		(54.7)
Net Carrying Amount	8.8		8.8		9.7
Aggregate Amortization Expense	0.5	$ 0.5	0.9	$ 0.9
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2020	1.4		1.4
2021	1.3		1.3
2022	1.3		1.3
2023	0.8		0.8
2024	0.6		$ 0.6
Technology
Definite-lived intangible assets:
Weighted Average Life (in years)			7 years
Gross Carrying Amount	9.4		$ 9.4		9.4
Accumulated Amortization	(8.9)		(8.9)		(8.8)
Net Carrying Amount	0.5		$ 0.5		0.6
Customer Relationships
Definite-lived intangible assets:
Weighted Average Life (in years)			22 years
Gross Carrying Amount	25.6		$ 25.6		25.6
Accumulated Amortization	(23.2)		(23.2)		(22.8)
Net Carrying Amount	2.4		$ 2.4		2.8
Land Use Rights
Definite-lived intangible assets:
Weighted Average Life (in years)			81 years
Gross Carrying Amount	4.2		$ 4.2		4.3
Accumulated Amortization	(0.7)		(0.7)		(0.7)
Net Carrying Amount	3.5		$ 3.5		3.6
Other
Definite-lived intangible assets:
Weighted Average Life (in years)			8 years
Gross Carrying Amount	25.1		$ 25.1		25.1
Accumulated Amortization	(22.7)		(22.7)		(22.4)
Net Carrying Amount	$ 2.4		$ 2.4		$ 2.7