Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Dividend Paid	Ordinary Shares	Capital in Excess of Par Value of Ordinary Shares	Retained Earnings (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	14.4				13.3		1.1
Other comprehensive income (loss)	84.8					86.4	(1.6)
Issuance of ordinary shares	1.2		1.2
Share-based compensation (Note 18)	26.8			26.8
Spin-off of Technip Energies (Note 25)	(897.2)			(1,108.4)		231.1	(19.9)
Accrued distributions to non-controlling interest	(15.0)						(15.0)
Dividends declared and paid (Note 17)		$ 0.0
Other	(10.9)				(1.9)		(9.0)
Ending 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	(81.8)				(107.2)		25.4
Other comprehensive income (loss)	(0.8)					3.3	(4.1)
Issuance of ordinary shares	0.1		1.6	(1.5)
Share-based compensation (Note 18)	40.5			40.5
Shares repurchased and cancelled	(100.2)		(10.1)	(90.1)
Dividends declared and paid (Note 17)		0.0
Other	0.5				1.0		(0.5)
Ending balance at Dec. 31, 2022	3,276.7		442.2	9,109.7	(5,010.0)	(1,301.7)	36.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51.9				56.2		(4.3)
Other comprehensive income (loss)	63.5					59.7	3.8
Issuance of ordinary shares	(17.1)		3.0	(20.1)
Share-based compensation (Note 18)	40.9			40.9
Shares repurchased and cancelled	(205.1)		(12.3)	(192.8)
Dividends declared and paid (Note 17)	(43.5)	$ (43.5)			(43.5)
Other	4.8			1.2	4.2		(0.6)
Ending balance at Dec. 31, 2023	$ 3,172.1		$ 432.9	$ 8,938.9	$ (4,993.1)	$ (1,242.0)	$ 35.4