BUSINESS SEGMENTS - Schedule of segment revenue and segment operating profit (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting, Measurement Disclosures [Abstract]
Number of reportable segments | segment	2
Segment Reporting Information
Revenue	$ 1,555.8	$ 1,632.0
Total segment operating profit	57.7	45.2
Corporate expense	(29.5)	(28.8)
Net interest expense	(33.9)	(34.5)
Loss on early extinguishment of debt	0.0	(23.5)
Income (loss) from investment in Technip Energies	(28.5)	470.1
Foreign exchange gains	28.4	28.1
Income (loss) before income taxes	(5.8)	456.6
Operating Segments | Subsea
Segment Reporting Information
Revenue	1,289.1	1,386.5
Total segment operating profit	54.0	37.0
Operating Segments | Surface Technologies
Segment Reporting Information
Revenue	266.7	245.5
Total segment operating profit	3.7	8.2
Corporate
Segment Reporting Information
Total corporate items	$ (63.5)	$ 411.4