IMPAIRMENT, RESTRUCTURING AND OTHER EXPENSES - Restructuring, Settlement and Impairment Provisions (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]
Total impairment, restructuring and other expenses	$ 2.0	$ 103.6	$ 27.5	$ 3,302.7
Subsea
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	1.0	95.8	20.7	2,869.4
Surface Technologies
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	1.0	6.7	3.8	431.1
Corporate and other
Restructuring Cost and Reserve [Line Items]
Total impairment, restructuring and other expenses	$ 0.0	$ 1.1	$ 3.0	$ 2.2