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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Apr. 22, 2022	Dec. 31, 2021
Definite-lived intangible assets:
Gross Carrying Amount	$ 70.7		$ 70.7			$ 72.4
Accumulated Amortization	(58.7)		(58.7)			(59.0)
Net Carrying Amount	12.0		12.0			13.4
Aggregate Amortization Expense	0.6	$ 0.5	1.2	$ 0.9
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2022	2.4		2.4
2023	1.9		1.9
2024	1.7		1.7
2025	1.5		1.5
2026	1.3		$ 1.3
Technology
Definite-lived intangible assets:
Weighted Average Life (in years)			7 years
Gross Carrying Amount	9.1		$ 9.1			9.8
Accumulated Amortization	(9.0)		(9.0)			(9.7)
Net Carrying Amount	0.1		$ 0.1			0.1
Customer Relationships
Definite-lived intangible assets:
Weighted Average Life (in years)			19 years
Gross Carrying Amount	31.6		$ 31.6			31.9
Accumulated Amortization	(25.7)		(25.7)			(25.4)
Net Carrying Amount	5.9		$ 5.9			6.5
Customer Relationships \| Steelweld
Definite-lived intangible assets:
Weighted Average Life (in years)			3 years
Intangible assets aquired					$ 0.6
Land Use Rights
Definite-lived intangible assets:
Weighted Average Life (in years)			80 years
Gross Carrying Amount	4.1		$ 4.1			4.4
Accumulated Amortization	(0.8)		(0.8)			(0.8)
Net Carrying Amount	3.3		$ 3.3			3.6
Other
Definite-lived intangible assets:
Weighted Average Life (in years)			8 years
Gross Carrying Amount	25.9		$ 25.9			26.3
Accumulated Amortization	(23.2)		(23.2)			(23.1)
Net Carrying Amount	$ 2.7		$ 2.7			$ 3.2