Condensed Consolidated Statements of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Ordinary Shares	Capital in Excess of Par Value of Ordinary Shares	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
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)	176.4			169.0		7.4
Other comprehensive loss	(8.2)				(6.7)	(1.5)
Issuance of ordinary shares	1.1	1.1
Share-based compensation	18.4		18.4
Spin-off of Technip Energies	(857.3)		(1,108.4)		271.0	(19.9)
Accrued distributions to non-controlling interest	(15.0)					(15.0)
Other	(10.3)			(1.5)		(8.8)
Ending balance at Sep. 30, 2021	3,519.4	450.6	9,152.4	(4,747.7)	(1,358.2)	22.3
Beginning balance at Jun. 30, 2021	3,629.3	450.6	9,144.7	(4,714.0)	(1,294.9)	42.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(30.6)			(32.2)		1.6
Other comprehensive loss	(64.7)				(63.3)	(1.4)
Share-based compensation	7.7		7.7
Accrued distributions to non-controlling interest	(15.0)					(15.0)
Other	(7.3)			(1.5)		(5.8)
Ending balance at Sep. 30, 2021	3,519.4	450.6	9,152.4	(4,747.7)	(1,358.2)	22.3
Beginning balance at Dec. 31, 2021	3,418.4	450.7	9,160.8	(4,903.8)	(1,305.0)	15.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(50.5)			(69.9)		19.4
Other comprehensive loss	(171.6)				(164.4)	(7.2)
Issuance of ordinary shares	(0.1)	1.5	(1.6)
Share-based compensation	28.9		28.9
Shares repurchased and cancelled	(50.1)	(5.8)	(44.3)
Other	(0.7)			(0.2)		(0.5)
Ending balance at Sep. 30, 2022	3,174.3	446.4	9,143.8	(4,973.9)	(1,469.4)	27.4
Beginning balance at Jun. 30, 2022	3,344.4	452.2	9,178.2	(4,964.0)	(1,347.0)	25.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4.6)			(10.3)		5.7
Other comprehensive loss	(125.2)				(122.4)	(2.8)
Share-based compensation	9.9		9.9
Shares repurchased and cancelled	(50.1)	(5.8)	(44.3)
Other	(0.1)			0.4		(0.5)
Ending balance at Sep. 30, 2022	$ 3,174.3	$ 446.4	$ 9,143.8	$ (4,973.9)	$ (1,469.4)	$ 27.4