Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Segment Reporting Information
Revenue		$ 3,335.7	$ 3,335.1	$ 9,624.5		$ 9,682.3
Total segment operating profit (loss)		142.8	211.1	(2,738.4)		821.4
Corporate expense		(27.7)	(75.6)	(125.7)		(278.6)
Net interest expense		(91.8)	(116.5)	(238.5)		(345.3)
Total corporate items		(113.9)	(245.3)	(407.7)		(706.7)
Income (loss) before income taxes		28.9	(34.2)	(3,146.1)	[1]	114.7	[1]
Impairment, restructuring and other expenses (Note 17)		(92.0)	(140.3)	(3,440.7)		(166.0)
Separation costs		0.0	(9.4)	(27.1)		(9.4)
Merger transaction and integration costs			(6.2)			(31.2)
Legal Fees			(0.6)			54.6
Other Corporate Expenses	[2]	23.9	57.4	89.3		169.9
Foreign Currency Transaction Gain (Loss), Realized		5.6	(53.2)	(43.5)		(82.8)
Subsea
Segment Reporting Information
Impairment, restructuring and other expenses (Note 17)		(43.4)	(131.2)	(2,912.8)		(138.0)
Technip Energies
Segment Reporting Information
Impairment, restructuring and other expenses (Note 17)		(36.1)	(5.2)	(78.8)		(11.1)
Surface Technologies
Segment Reporting Information
Impairment, restructuring and other expenses (Note 17)		(8.7)	(0.7)	(439.8)		(3.4)
Corporate and other
Segment Reporting Information
Impairment, restructuring and other expenses (Note 17)		(3.8)	(3.2)	(9.3)		(13.5)
Operating Segments | Subsea
Segment Reporting Information
Revenue		1,501.8	1,342.2	4,133.4		4,036.2
Total segment operating profit (loss)		20.3	(79.6)	(2,806.0)		65.0
Operating Segments | Technip Energies
Segment Reporting Information
Revenue		1,608.2	1,596.3	4,694.2		4,436.4
Total segment operating profit (loss)		129.5	284.6	512.0		714.3
Operating Segments | Surface Technologies
Segment Reporting Information
Revenue		225.7	396.6	796.9		1,209.7
Total segment operating profit (loss)		$ (7.0)	$ 6.1	$ (444.4)		$ 42.1

[1] Includes amounts attributable to non-controlling interests.

[2] Other corporate expenses primarily include corporate staff expenses, share-based compensation expenses, and other employee benefits.