Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information
Revenue		$ 3,130.3	$ 2,913.0
Total segment operating profit (loss)		(3,023.5)	216.1
Corporate expense	[1]	(112.2)	(93.6)
Net interest expense		(72.3)	(88.2)
Total corporate items		(184.5)	(181.8)
Income (loss) before income taxes	[2]	(3,208.0)	34.3
Operating Segments | Subsea
Segment Reporting Information
Revenue		1,253.1	1,185.3
Total segment operating profit (loss)		(2,750.7)	49.9
Operating Segments | Technip Energies
Segment Reporting Information
Revenue		1,547.7	1,335.1
Total segment operating profit (loss)		151.2	155.7
Operating Segments | Surface Technologies
Segment Reporting Information
Revenue		329.5	392.6
Total segment operating profit (loss)		$ (424.0)	$ 10.5

[1] Corporate expense primarily includes corporate staff expenses, legal reserve, stock-based compensation expenses, other employee benefits, certain foreign exchange gains and losses, and merger transaction integration and separation expenses.

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