GOODWILL AND INTANGIBLE ASSETS, NET GOODWILL AND INTANGIBLE ASSETS, NET - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jul. 06, 2021	Dec. 31, 2020
Definite-lived intangible assets:
Gross Carrying Amount	$ 72.7		$ 72.7			$ 66.1
Accumulated Amortization	(58.6)		(58.6)			(57.8)
Net Carrying Amount	14.1		14.1			8.3
Aggregate Amortization Expense	0.7	$ 0.4	1.6	$ 1.3
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2021	2.2		2.2
2022	2.3		2.3
2023	1.7		1.7
2024	1.5		1.5
2025	1.4		$ 1.4
Technology
Definite-lived intangible assets:
Weighted Average Life (in years)			8 years
Gross Carrying Amount	10.0		$ 10.0			10.1
Accumulated Amortization	(9.8)		(9.8)			(9.6)
Net Carrying Amount	0.2		$ 0.2			0.5
Customer Relationships
Definite-lived intangible assets:
Weighted Average Life (in years)			19 years
Gross Carrying Amount	32.1		$ 32.1			26.1
Accumulated Amortization	(25.0)		(25.0)			(24.1)
Net Carrying Amount	7.1		$ 7.1			2.0
Customer Relationships | Murray Design & Engineering, Ltd.
Definite-lived intangible assets:
Weighted Average Life (in years)			7 years
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Intangible assets aquired					$ 6.3
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	26.3		$ 26.3			25.5
Accumulated Amortization	(23.0)		(23.0)			(23.4)
Net Carrying Amount	$ 3.3		$ 3.3			$ 2.1
Trademarks | Murray Design & Engineering, Ltd.
Definite-lived intangible assets:
Weighted Average Life (in years)			10 years
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Intangible assets aquired					$ 1.3