Business Segments (Segment Operating Capital Employed And Segment Assets) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information
Total assets		$ 19,927.6	$ 23,518.8
Operating Segments
Segment Reporting Information
Total assets		13,971.4	17,485.5
Operating Segments | Subsea
Segment Reporting Information
Total assets		7,510.5	10,824.2
Operating Segments | Technip Energies
Segment Reporting Information
Total assets		4,747.7	4,448.8
Operating Segments | Surface Technologies
Segment Reporting Information
Total assets		1,739.6	2,246.4
Intercompany eliminations
Segment Reporting Information
Total assets		(26.4)	(33.9)
Corporate
Segment Reporting Information
Total assets	[1]	$ 5,956.2	$ 6,033.3

[1] Corporate includes cash, LIFO adjustments, deferred income tax balances, property, plant and equipment not associated with a specific segment, pension assets and the fair value of derivative financial instruments.