IMPAIRMENT, RESTRUCTURING AND OTHER EXPENSES - Restructuring and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 6.7	$ 6.0
COVID-19 expenses		5.1
Subsea
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	4.0	(6.9)
COVID-19 expenses		4.0
Surface Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	2.7	11.8
COVID-19 expenses		1.1
Corporate and other
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 0.0	1.1
COVID-19 expenses		$ 0.0