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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Definite-lived intangible assets:
Gross Carrying Amount	$ 65.7		$ 65.7		$ 66.1
Accumulated Amortization	(58.3)		(58.3)		(57.8)
Net Carrying Amount	7.4		7.4		8.3
Aggregate Amortization Expense	0.5	$ 0.5	0.9	$ 0.9
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2021	1.7		1.7
2022	1.3		1.3
2023	0.7		0.7
2024	0.5		0.5
2025	0.4		$ 0.4
Technology
Definite-lived intangible assets:
Weighted Average Life (in years)			8 years
Gross Carrying Amount	10.2		$ 10.2		10.1
Accumulated Amortization	(10.0)		(10.0)		(9.6)
Net Carrying Amount	0.2		$ 0.2		0.5
Customer Relationships
Definite-lived intangible assets:
Weighted Average Life (in years)			22 years
Gross Carrying Amount	26.0		$ 26.0		26.1
Accumulated Amortization	(24.6)		(24.6)		(24.1)
Net Carrying Amount	1.4		$ 1.4		2.0
Land Use Rights
Definite-lived intangible assets:
Weighted Average Life (in years)			80 years
Gross Carrying Amount	4.3		$ 4.3		4.4
Accumulated Amortization	(0.8)		(0.8)		(0.7)
Net Carrying Amount	3.5		$ 3.5		3.7
Other
Definite-lived intangible assets:
Weighted Average Life (in years)			8 years
Gross Carrying Amount	25.2		$ 25.2		25.5
Accumulated Amortization	(22.9)		(22.9)		(23.4)
Net Carrying Amount	$ 2.3		$ 2.3		$ 2.1