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 - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Definite-lived intangible assets:
Gross Carrying Amount	$ 78.3		$ 78.3		$ 79.3
Accumulated Amortization	(64.2)		(64.2)		(63.6)
Net Carrying Amount	14.1		14.1		15.7
Aggregate Amortization Expense	0.6	$ 0.6	1.2	$ 1.4
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2024	2.4		2.4
2025	2.3		2.3
2026	2.1		2.1
2027	2.1		2.1
2028	$ 1.2		$ 1.2
Technology
Definite-lived intangible assets:
Weighted Average Life (in years)	7 years		7 years
Gross Carrying Amount	$ 9.4		$ 9.4		9.6
Accumulated Amortization	(9.2)		(9.2)		(9.5)
Net Carrying Amount	$ 0.2		$ 0.2		0.1
Customer Relationships
Definite-lived intangible assets:
Weighted Average Life (in years)	17 years		17 years
Gross Carrying Amount	$ 35.1		$ 35.1		35.5
Accumulated Amortization	(29.2)		(29.2)		(28.7)
Net Carrying Amount	$ 5.9		$ 5.9		6.8
Land Use Rights
Definite-lived intangible assets:
Weighted Average Life (in years)	80 years		80 years
Gross Carrying Amount	$ 3.9		$ 3.9		3.9
Accumulated Amortization	(0.8)		(0.8)		(0.8)
Net Carrying Amount	$ 3.1		$ 3.1		3.1
Other
Definite-lived intangible assets:
Weighted Average Life (in years)	9 years		9 years
Gross Carrying Amount	$ 29.9		$ 29.9		30.3
Accumulated Amortization	(25.0)		(25.0)		(24.6)
Net Carrying Amount	$ 4.9		$ 4.9		$ 5.7