BUSINESS SEGMENTS - Schedule of segment revenue and segment operating profit (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Segment Reporting, Measurement Disclosures [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information
Total segment revenue	$ 1,717.2	$ 1,668.8	$ 3,273.0	$ 3,300.8
Total segment operating profit	107.1	85.3	164.8	130.5
Corporate expense	(22.0)	(30.3)	(51.5)	(59.1)
Net interest expense	(27.7)	(35.2)	(61.6)	(69.7)
Loss on early extinguishment of debt	(29.8)	0.0	(29.8)	(23.5)
Income (loss) from investment in Technip Energies	0.8	(146.8)	(27.7)	323.3
Foreign exchange gains (losses)	(0.8)	(10.7)	27.6	17.4
Income (loss) before income taxes	27.6	(137.7)	21.8	318.9
Operating Segments | Subsea
Segment Reporting Information
Total segment revenue	1,414.6	1,394.3	2,703.7	2,780.8
Total segment operating profit	97.1	72.4	151.1	109.4
Operating Segments | Surface Technologies
Segment Reporting Information
Total segment revenue	302.6	274.5	569.3	520.0
Total segment operating profit	10.0	12.9	13.7	21.1
Corporate
Segment Reporting Information
Total corporate items	$ (79.5)	$ (223.0)	$ (143.0)	$ 188.4