INVESTMENTS - Percentage Owned and Carrying Value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investment in Technip Energies	$ 292.4	$ 305.5
Techdof Brasil AS
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Investment in Technip Energies	$ 276.9	234.7
Magma Global Limited
Schedule of Equity Method Investments [Line Items]
Ownership percentage	0.00%
Investment in Technip Energies	$ 0.0	51.4
Serimax Holdings SAS
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Investment in Technip Energies	$ 15.0	18.8
Other
Schedule of Equity Method Investments [Line Items]
Investment in Technip Energies	$ 0.5	$ 0.6
Magma Global Limited
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Serimax Holdings SAS
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%