IMPAIRMENT, RESTRUCTURING AND OTHER EXPENSES - Restructuring and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 1.2	$ 38.3	$ 7.9	$ 44.3
COVID-19 expenses		31.6		36.7
Subsea
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	0.4	35.9	4.4	29.0
COVID-19 expenses		27.4		31.4
Surface Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	0.8	1.3	3.5	13.1
COVID-19 expenses		4.2		5.3
Corporate and other
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 0.0	1.1	$ 0.0	2.2
COVID-19 expenses		$ 0.0		$ 0.0