IMPAIRMENT, RESTRUCTURING AND OTHER EXPENSES - Restructuring, Settlement and Impairment Provisions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	$ 7.3	$ 53.5	$ 34.8	$ 3,356.2
Subsea
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	6.9	43.4	27.6	2,912.8
Surface Technologies
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	0.0	8.7	3.8	439.8
Corporate and other
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	$ 0.4	$ 1.4	$ 3.4	$ 3.6