IMPAIRMENT, RESTRUCTURING AND OTHER EXPENSES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring and Impairment
Total impairments	$ 18.8	$ 3,188.0
COVID-19 expenses		5.1
Property, Plant and Equipment
Restructuring and Impairment
Total impairments	18.8	104.6
Subsea
Restructuring and Impairment
Total impairments	15.7	2,776.5
Goodwill, impairment loss		2,747.5
COVID-19 expenses		4.0
Subsea | Property, Plant and Equipment
Restructuring and Impairment
Other asset impairment charges		29.0
Surface Technologies
Restructuring and Impairment
Total impairments	$ 0.1	411.5
Goodwill, impairment loss		335.9
COVID-19 expenses		1.1
Surface Technologies | Property, Plant and Equipment
Restructuring and Impairment
Other asset impairment charges		$ 75.6