Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 117.9	$ 301.7	$ 261.7	$ 526.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	[1]	0.2	(2.3)	(34.7)	(27.2)
Net unrealized gains (losses) on available-for-sale securities:
Net unrealized gains (losses) arising during the period			(3.7)		1.3
Net unrealized gains (losses) on available-for-sale securities	[2]		(3.7)		1.3
Net gains (losses) on hedging instruments:
Net gains (losses) arising during the period		32.7	(51.7)	74.9	(9.0)
Reclassification adjustment for net losses included in net income		19.5	13.8	74.3	76.4
Net gains (losses) on hedging instruments (3)	[3]	52.2	(37.9)	149.2	67.4
Pension and other post-retirement benefits:
Net losses arising during the period		(2.8)	(0.3)	(4.0)	(16.5)
Reclassification adjustment for amortization of prior service cost included in net income		0.2	0.2	0.4	0.4
Reclassification adjustment for amortization of net actuarial loss included in net income		0.5	0.1	1.4	0.5
Net pension and other post-retirement benefits	[4]	(2.1)	0.0	(2.2)	(15.6)
Other comprehensive income (loss), net of tax		50.3	(43.9)	112.3	25.9
Comprehensive income		168.2	257.8	374.0	552.0
Comprehensive (income) loss attributable to noncontrolling interest		2.6	(14.0)	4.8	(13.0)
Comprehensive income attributable to TechnipFMC plc		$ 170.8	$ 243.8	$ 378.8	$ 539.0

[1] Net of income tax (expense) benefit of (0.9) and nil for the three months ended September 30, 2017 and 2016, respectively, and $(4.8) and nil for the nine months ended September 30, 2017 and 2016, respectively.

[2] Net of income tax (expense) benefit of nil and nil for the three months ended September 30, 2017 and 2016, respectively, and nil and nil for the nine months ended September 30, 2017 and 2016, respectively.

[3] Net of income tax (expense) benefit of $(12.1) and $(4.8) for the three months ended September 30, 2017 and 2016, respectively, and $(49.4) and $(25.7) for the nine months ended September 30, 2017 and 2016, respectively.

[4] Net of income tax (expense) benefit of $0.7 and $0.2 for the three months ended September 30, 2017 and 2016, respectively, and $1.1 and $0.4 for the nine months ended September 30, 2017 and 2016, respectively.