Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Technip Energies	Cumulative Effect, Period of Adoption, Adjustment	Ordinary Shares	Capital in Excess of Par Value of Ordinary Shares	(Accumulated Deficit) Retained Earnings	(Accumulated Deficit) Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning balance at Dec. 31, 2019	$ 7,688.1		$ (7.8)	$ 447.1	$ 10,182.8	$ (1,563.1)	$ (7.8)	$ (1,407.5)	$ 28.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,256.1)					(3,256.1)
Net income (loss)	(3,245.7)								10.4
Other comprehensive loss	(305.3)							(294.2)	(11.1)
Issuance of ordinary shares	(6.4)			1.2	(7.6)
Cash dividends declared	(59.2)					(59.2)
Share-based compensation (Note 15)	21.6				21.6
Other	(0.5)					(0.8)			0.3
Ending balance at Mar. 31, 2020	4,084.8			448.3	10,196.8	(4,887.0)		(1,701.7)	28.4
Beginning balance at Dec. 31, 2020	4,214.3			449.5	10,242.4	(4,915.2)		(1,622.5)	60.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	368.2					368.2
Net income (loss)	371.9								3.7
Other comprehensive loss	(36.9)							(37.0)	0.1
Issuance of ordinary shares	0.3			0.3
Share-based compensation (Note 15)	3.4				3.4
Spin-off of Technip Energies (Note 2)		$ (854.9)			(1,093.7)	0.0		258.7	(19.9)
Other	(2.6)								(2.6)
Ending balance at Mar. 31, 2021	$ 3,695.5			$ 449.8	$ 9,152.1	$ (4,547.0)		$ (1,400.8)	$ 41.4