Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 06, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	TechnipFMC plc
Entity Central Index Key	0001681459
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Trading Symbol	fti
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		448,063,138