Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Lease revenue	$ 32.8	$ 51.0
Total revenue	1,632.0	1,582.6
Costs and expenses
Cost of lease revenue	26.2	38.0
Selling, general and administrative expense	147.6	195.3
Research and development expense	16.5	25.4
Impairment, restructuring and other expenses (Note 16)	25.5	3,199.1
Total costs and expenses	1,630.8	4,823.9
Other income (expense), net	35.6	(7.9)
Income from equity affiliates (Note 11)	7.7	21.1
Income from investment in Technip Energies (Note 11)	470.1	0.0
Income (loss) before net interest expense and income taxes	514.6	(3,228.1)
Interest income	4.1	9.8
Interest expense	(38.6)	(32.8)
Loss on early extinguishment of debt	(23.5)	0.0
Income (loss) before income taxes	456.6	(3,251.1)
Provision (benefit) for income taxes (Note 18)	24.5	(23.2)
Income (loss) from continuing operations	432.1	(3,227.9)
Income from continuing operations attributable to non-controlling interests	(1.8)	(6.9)
Income (loss) from continuing operations attributable to TechnipFMC plc	430.3	(3,234.8)
Income (loss) from discontinued operations	(60.2)	(17.8)
Income from discontinued operations attributable to non-controlling interests	(1.9)	(3.5)
Net Income (loss) attributable to TechnipFMC plc	$ 368.2	$ (3,256.1)
Earnings Per Share, Basic and Diluted [Abstract]
Earnings (loss) per share from continuing operations basic (usd per share)	$ 0.96	$ (7.23)
Earnings (loss) per share from continued operations diluted (usd per share)	0.95	(7.23)
Earnings (loss) per share from discontinued operations basic (usd per share)	(0.14)	(0.05)
Earnings (loss) per share from discontinued operations diluted (usd per share)	(0.14)	(0.05)
Earnings (loss) attributable to TechnipFMC plc, Basic (usd per share)	0.82	(7.28)
Earnings (loss) attributable to TechnipFMC plc, Diluted (usd per share)	$ 0.81	$ (7.28)
Weighted average shares outstanding (Note 6)
Basic (in shares)	449.7	447.5
Diluted (in shares)	451.1	447.5
Service revenue
Revenue
Revenue	$ 826.2	$ 773.6
Costs and expenses
Cost of goods and services sold	743.8	704.4
Products
Revenue
Revenue	773.0	758.0
Costs and expenses
Cost of goods and services sold	$ 671.2	$ 661.7