BUSINESS SEGMENTS - Schedule Of Segment Revenue And Segment Operating Profit (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Revenues	$ 6,403.5	$ 6,530.6	$ 6,950.2
Total segment operating profit	183.4	(3,244.8)	(2,105.4)
Merger transaction and integration costs	0.0	0.0	(14.2)
Legal expenses			(33.0)
Other corporate expenses	(118.1)	(131.9)	(191.7)
Net interest expense	(143.3)	(81.8)	(91.3)
Loss on early extinguishment of debt	(61.9)	0.0	0.0
Income from investment in Technip Energies	322.2	0.0	0.0
Foreign exchange gains (losses)	15.8	(40.2)	(135.5)
Loss before income taxes	198.1	(3,498.7)	(2,571.1)
Subsea
Segment Reporting Information [Line Items]
Revenues	5,329.1	5,471.4	5,419.5
Surface Technologies
Segment Reporting Information [Line Items]
Revenues	1,074.4	1,059.2	1,530.7
Operating segments | Subsea
Segment Reporting Information [Line Items]
Revenues	5,329.1	5,471.4	5,419.5
Total segment operating profit	141.4	(2,815.5)	(1,442.7)
Operating segments | Surface Technologies
Segment Reporting Information [Line Items]
Revenues	1,074.4	1,059.2	1,530.7
Total segment operating profit	42.0	(429.3)	(662.7)
Corporate
Segment Reporting Information [Line Items]
Total corporate items	$ 14.7	$ (253.9)	$ (465.7)