REVENUE - Disaggregation of revenue, geographical (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Lease revenue	$ 52.4	$ 38.4	$ 157.5	$ 117.8
Total revenue	1,733.0	1,579.4	5,006.0	4,880.2
Services
Disaggregation of Revenue [Line Items]
Revenue	902.0	901.0	2,773.6	2,640.6
Products
Disaggregation of Revenue [Line Items]
Revenue	778.6	640.0	2,074.9	2,121.8
Subsea
Disaggregation of Revenue [Line Items]
Revenue	1,415.0	1,312.1	4,118.7	4,092.9
Lease revenue	14.0	8.8	44.3	36.2
Subsea | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	1,415.0	1,312.1	4,118.7	4,092.9
Subsea | Services
Disaggregation of Revenue [Line Items]
Revenue	845.0	861.7	2,611.0	2,530.2
Subsea | Products
Disaggregation of Revenue [Line Items]
Revenue	556.0	441.6	1,463.4	1,526.5
Subsea | Europe and Central Asia
Disaggregation of Revenue [Line Items]
Revenue	395.0	423.2	1,154.6	1,102.9
Subsea | Latin America
Disaggregation of Revenue [Line Items]
Revenue	411.7	211.5	1,069.0	809.7
Subsea | Africa
Disaggregation of Revenue [Line Items]
Revenue	216.5	257.8	653.3	822.6
Subsea | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	162.7	244.9	586.3	736.8
Subsea | North America
Disaggregation of Revenue [Line Items]
Revenue	205.1	174.7	582.3	594.4
Subsea | Middle East
Disaggregation of Revenue [Line Items]
Revenue	24.0	0.0	73.2	26.5
Surface Technologies
Disaggregation of Revenue [Line Items]
Revenue	318.0	267.3	887.3	787.3
Lease revenue	38.4	29.6	113.2	81.6
Surface Technologies | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	318.0	267.3	887.3	787.3
Surface Technologies | Services
Disaggregation of Revenue [Line Items]
Revenue	57.0	39.3	162.6	110.4
Surface Technologies | Products
Disaggregation of Revenue [Line Items]
Revenue	222.6	198.4	611.5	595.3
Surface Technologies | Europe and Central Asia
Disaggregation of Revenue [Line Items]
Revenue	42.1	46.3	121.6	145.2
Surface Technologies | Latin America
Disaggregation of Revenue [Line Items]
Revenue	30.1	22.7	78.9	57.8
Surface Technologies | Africa
Disaggregation of Revenue [Line Items]
Revenue	7.6	8.5	25.7	31.2
Surface Technologies | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	26.4	20.9	70.6	72.2
Surface Technologies | North America
Disaggregation of Revenue [Line Items]
Revenue	146.2	99.3	406.9	266.6
Surface Technologies | Middle East
Disaggregation of Revenue [Line Items]
Revenue	$ 65.6	$ 69.6	$ 183.6	$ 214.3