Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Service revenue		$ 3,374.9	$ 2,360.0	$ 9,301.0	$ 7,089.6
Product revenue		710.9	15.7	1,928.2	62.3
Lease and other revenue		55.1		144.7
Total revenue		4,140.9	2,375.7	11,373.9	7,151.9
Costs and expenses:
Cost of service revenue		2,841.3	1,925.4	7,728.4	5,825.4
Cost of product revenue		589.4	5.6	1,781.9	38.3
Cost of lease and other revenue		37.5		100.2
Selling, general and administrative expense		284.4	143.0	806.5	434.0
Research and development expense		51.1	22.0	143.6	67.8
Impairment, restructuring and other expense (Note 5)		59.4	10.2	56.8	109.7
Merger transaction and integration costs (Note 2)		9.2	14.0	87.2	30.7
Total costs and expenses		3,872.3	2,120.2	10,704.6	6,505.9
Other income (expense), net		30.0	81.7	43.2	(17.5)
Income from equity affiliates (Note 8)		17.3	67.4	39.4	72.8
Income before net interest expense and income taxes		315.9	404.6	751.9	701.3
Net interest expense		(86.3)	(0.4)	(240.5)	(21.4)
Income before income taxes	[1]	229.6	404.2	511.4	679.9
Provision for income taxes (Note 14)		111.7	102.5	249.7	153.8
Net income		117.9	301.7	261.7	526.1
Net loss attributable to noncontrolling interests		3.1	0.7	5.5	1.0
Net income attributable to TechnipFMC plc		$ 121.0	$ 302.4	$ 267.2	$ 527.1
Earnings per share attributable to TechnipFMC plc (Note 4):
Basic (usd per share)		$ 0.26	$ 2.50	$ 0.57	$ 4.41
Diluted (usd per share)		$ 0.26	$ 2.39	$ 0.57	$ 4.22
Weighted average shares outstanding (Note 4):
Basic (in shares)		467.2	121.0	466.8	119.6
Diluted (in shares)		469.7	126.9	468.3	125.3

[1] Includes amounts attributable to noncontrolling interests.