Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss) attributable to TechnipFMC plc		$ 13.3	$ (3,287.6)	$ (2,415.2)
(Income) loss from continuing operations attributable to non-controlling interests		(0.8)	34.5	(4.6)
Income from discontinued operations attributable to non-controlling interests		1.9	15.2	7.7
Net income (loss) attributable to TechnipFMC plc, including non-controlling interests		14.4	(3,237.9)	(2,412.1)
Foreign currency translation adjustments
Net gains (losses) arising during the period		27.6	(169.1)	15.6
Reclassification adjustment for net (gains) losses included in net income, net of tax		0.0	0.0	(12.0)
Foreign currency translation adjustments	[1]	27.6	(169.1)	3.6
Net gains (losses) on hedging instruments
Net gains (losses) arising during the period		(19.8)	25.4	8.9
Reclassification adjustment for net (gains) losses included in net income		(11.8)	13.0	18.2
Net gains (losses) on hedging instruments	[2]	(31.6)	38.4	27.1
Pension and other post-retirement benefits
Net gains (losses) arising during the period		71.2	(88.3)	(81.5)
Prior service cost arising during the period		(0.4)	(4.6)	(0.7)
Reclassification adjustment for settlement losses included in net income		2.7	1.4	0.2
Reclassification adjustment for amortization of prior service cost included in net income		0.4	0.9	2.0
Reclassification adjustment for amortization of net actuarial loss included in net income		14.9	6.9	0.8
Net pension and other post-retirement benefits	[3]	88.8	(83.7)	(79.2)
Other comprehensive income (loss), net of tax		84.8	(214.4)	(48.5)
Comprehensive income (loss)		99.2	(3,452.3)	(2,460.6)
Comprehensive income attributable to non-controlling interests		0.5	(50.3)	(2.4)
Comprehensive income (loss) attributable to TechnipFMC plc		$ 99.7	$ (3,502.6)	$ (2,463.0)

[1] Net of income tax (expense) benefit of nil, nil and $7.9 million for the years ended December 31, 2021, 2020 and 2019, respectively.

[2] Net of income tax (expense) benefit of $8.8 million, $(9.7) million and $(6.9) million for the years ended December 31, 2021, 2020 and 2019, respectively.

[3] Net of income tax (expense) benefit of $(19.6) million, $25.5 million and $20.3 million for the years ended December 31, 2021, 2020 and 2019, respectively.