Impairment, Restructuring and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring and Impairment
Impairment, restructuring and other expenses	$ 3,208.4	$ 16.5
Subsea
Restructuring and Impairment
Impairment, restructuring and other expenses	2,773.6	2.3
Technip Energies
Restructuring and Impairment
Impairment, restructuring and other expenses	6.8	3.8
Surface Technologies
Restructuring and Impairment
Impairment, restructuring and other expenses	424.4	1.5
Corporate and other
Restructuring and Impairment
Impairment, restructuring and other expenses	$ 3.6	$ 8.9