REVENUE - Disaggregation of Revenue, Geographical (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Lease revenue	$ 32.8	$ 51.0
Total revenue	1,632.0	1,582.6
Services
Disaggregation of Revenue [Line Items]
Revenue	826.2	773.6
Products
Disaggregation of Revenue [Line Items]
Revenue	773.0	758.0
Subsea
Disaggregation of Revenue [Line Items]
Revenue	1,375.2	1,233.6
Lease revenue	11.3	19.5
Subsea | Services
Disaggregation of Revenue [Line Items]
Revenue	793.4	717.5
Subsea | Products
Disaggregation of Revenue [Line Items]
Revenue	581.8	516.1
Subsea | Europe, Russia, Central Asia
Disaggregation of Revenue [Line Items]
Revenue	255.9	423.1
Subsea | Americas
Disaggregation of Revenue [Line Items]
Revenue	561.7	436.5
Subsea | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	241.6	137.6
Subsea | Africa
Disaggregation of Revenue [Line Items]
Revenue	292.2	214.6
Subsea | Middle East
Disaggregation of Revenue [Line Items]
Revenue	23.8	21.8
Surface Technologies
Disaggregation of Revenue [Line Items]
Revenue	224.0	298.0
Lease revenue	21.5	31.5
Surface Technologies | Services
Disaggregation of Revenue [Line Items]
Revenue	32.8	56.1
Surface Technologies | Products
Disaggregation of Revenue [Line Items]
Revenue	191.2	241.9
Surface Technologies | Europe, Russia, Central Asia
Disaggregation of Revenue [Line Items]
Revenue	42.1	50.3
Surface Technologies | Americas
Disaggregation of Revenue [Line Items]
Revenue	75.2	149.3
Surface Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	24.0	34.3
Surface Technologies | Africa
Disaggregation of Revenue [Line Items]
Revenue	8.2	13.6
Surface Technologies | Middle East
Disaggregation of Revenue [Line Items]
Revenue	74.5	50.5
Operating Segments | Subsea
Disaggregation of Revenue [Line Items]
Total revenue	1,386.5	1,253.1
Operating Segments | Surface Technologies
Disaggregation of Revenue [Line Items]
Total revenue	$ 245.5	$ 329.5