IMPAIRMENT, RESTRUCTURING AND OTHER EXPENSES - Goodwill and Long-Lived Assets Impairments Goodwill and Long-Lived Assets Impairments (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 impairments	$ 0.8	$ 33.7	$ 19.6	$ 3,221.7
Subsea
Restructuring Cost and Reserve [Line Items]
Total impairments	0.6	32.5	16.3	2,809.0
Surface Technologies
Restructuring Cost and Reserve [Line Items]
Total impairments	0.2	1.2	0.3	412.7
Corporate and other
Restructuring Cost and Reserve [Line Items]
Total impairments	$ 0.0	$ 0.0	$ 3.0	$ 0.0