Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Service revenue		$ 12,210.5	$ 9,128.7	$ 11,323.1
Product revenue		2,651.8	70.9	148.8
Lease and other revenue		194.6	0.0	0.0
Total revenue		15,056.9	9,199.6	11,471.9
Costs and expenses:
Cost of service revenue		9,984.0	7,585.7	9,863.0
Cost of product revenue		2,403.4	44.3	112.1
Cost of lease and other revenue		137.2	0.0	0.0
Selling, general and administrative expense		1,060.9	572.6	689.6
Research and development expense		212.9	105.4	95.5
Impairment, restructuring and other expense (Note 5)		191.5	343.0	438.1
Merger transaction and integration costs (Note 2)		101.8	92.6	0.0
Total costs and expenses		14,091.7	8,743.6	11,198.3
Other income (expense), net		(25.9)	6.5	(102.9)
Income from equity affiliates (Note 8)		55.6	117.7	51.0
Income before interest income, interest expense and income taxes		994.9	580.2	221.7
Interest income		140.8	85.3	77.7
Interest expense		(456.0)	(114.1)	(148.9)
Income before income taxes	[1]	679.7	551.4	150.5
Provision for income taxes (Note 17)		545.5	180.3	136.5
Net income		134.2	371.1	14.0
Net (income) loss attributable to noncontrolling interests		(20.9)	22.2	0.4
Net income attributable to TechnipFMC plc		$ 113.3	$ 393.3	$ 14.4
Earnings per share attributable to TechnipFMC plc (Note 4):
Basic earnings (loss) per share (usd per share)		$ 0.24	$ 3.29	$ 0.13
Diluted earnings (loss) per share (usd per share)		$ 0.24	$ 3.16	$ 0.13
Weighted average shares outstanding (Note 4):
Basic (in shares)		466.7	119.4	114.9
Diluted (in shares)		468.3	125.1	127.3

[1] Includes amounts attributable to noncontrolling interests.