Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 134.2	$ 371.1	$ 14.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	[1]	(87.2)	(71.4)	(394.9)
Net gains (losses) on hedging instruments:
Net gains (losses) arising during the period		53.8	(64.8)	(70.5)
Reclassification adjustment for net gains included in net income		101.2	120.1	67.8
Net gains (losses) on hedging instruments	[2]	155.0	55.3	(2.7)
Pension and other post-retirement benefits:
Net gains arising during the period		43.2	7.0	18.6
Prior service cost arising during the period		0.0	0.0	0.2
Reclassification adjustment for settlement losses included in net income		(15.2)	(7.4)	0.0
Reclassification adjustment for amortization of prior service cost included in net income		0.7	0.5	0.5
Reclassification adjustment for amortization of net actuarial loss included in net income		1.8	0.7	2.6
Net pension and other post-retirement benefits	[3]	30.5	0.8	21.9
Other comprehensive income (loss), net of tax		98.3	(15.3)	(375.7)
Comprehensive income (loss)		232.5	355.8	(361.7)
Comprehensive (income) loss attributable to noncontrolling interest		(21.3)	20.9	3.0
Comprehensive income (loss) attributable to TechnipFMC plc		$ 211.2	$ 376.7	$ (358.7)

[1] Net of income tax (expense) benefit of $(11.5), nil and nil for the years ended December 31, 2017, 2016 and 2015, respectively.

[2] Net of income tax (expense) benefit of $(52.5), $(24.3) and $(4.7) for the years ended December 31, 2017, 2016 and 2015, respectively.

[3] Net of income tax (expense) benefit of $(11.7), $1.0 and $(9.3) for the years ended December 31, 2017, 2016 and 2015, respectively.