Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to TechnipFMC plc		$ 56.2	$ (107.2)	$ 13.3
(Income) loss from continuing operations attributable to non-controlling interests		4.3	(25.4)	0.8
Income from discontinued operations attributable to non-controlling interests		0.0	0.0	(1.9)
Net income (loss) attributable to TechnipFMC plc, including non-controlling interests		51.9	(81.8)	14.4
Foreign currency translation adjustments
Net gains (losses) arising during the period		68.0	(20.2)	27.6
Reclassification adjustment for net gains included in net loss		(7.0)	(3.2)	0.0
Foreign currency translation adjustments	[1]	61.0	(23.4)	27.6
Net gains (losses) on hedging instruments
Net gains (losses) arising during the period		41.6	(25.1)	(19.8)
Reclassification adjustment for net (gains) losses included in net income		(3.6)	25.3	(11.8)
Net gains (losses) on hedging instruments	[2]	38.0	0.2	(31.6)
Pension and other post-retirement benefits
Net gains (losses) arising during the period		(44.7)	13.3	71.2
Prior service cost arising during the period		0.0	0.0	(0.4)
Reclassification adjustment for settlement losses included in net income		0.0	0.6	2.7
Reclassification adjustment for amortization of prior service cost included in net income		0.3	0.2	0.4
Reclassification adjustment for amortization of net actuarial loss included in net income		8.9	8.3	14.9
Net pension and other post-retirement benefits	[3]	(35.5)	22.4	88.8
Other comprehensive income (loss), net of tax		63.5	(0.8)	84.8
Comprehensive income (loss)		115.4	(82.6)	99.2
Comprehensive (income) loss attributable to non-controlling interests		0.5	(21.3)	0.5
Comprehensive income (loss) attributable to TechnipFMC plc		$ 115.9	$ (103.9)	$ 99.7

[1] Net of income tax (expense) benefit of nil for each of the years ended December 31, 2023, 2022 and 2021.

[2] Net of income tax (expense) benefit of $(3.0) million, $(8.0) million and $8.8 million for the years ended December 31, 2023, 2022 and 2021, respectively.

[3] Net of income tax (expense) benefit of $3.7 million, $(9.6) million and $(19.6) million for the years ended December 31, 2023, 2022 and 2021, respectively.