Separation Transaction (Details) - USD ($) $ in Millions			12 Months Ended
	Feb. 25, 2021	Feb. 16, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Separation costs			$ 39.5	$ 72.1	$ 0.0
Subsequent Event
Subsequent Event [Line Items]
Spin-off, Shares Received for Each Share Owned		1
Spin-off, shares given for share received		5
Ownership stake, floor	1182.00%
Ownership stake, cap	1725.00%
Ownership stake, discount	600.00%
Technip Energies N.V. | Subsequent Event
Subsequent Event [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		5010.00%
BPI France | Subsequent Event
Subsequent Event [Line Items]
Business Combination, Consideration Transferred	$ 200.0