Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Lease and other revenue	$ 53.3	$ 55.9	$ 102.7	$ 89.6
Total revenue	2,960.9	3,845.0	6,086.1	7,233.0
Costs and expenses
Cost of service revenue	1,846.9	2,509.5	3,799.4	4,887.1
Cost of product revenue	544.1	614.8	1,078.9	1,192.5
Cost of lease and other revenue	31.2	37.7	68.5	62.7
Selling, general and administrative expense	281.4	268.0	584.5	522.1
Research and development expense	53.6	49.1	94.7	92.5
Impairment, restructuring and other expenses (Note 14)	11.4	(12.3)	22.9	(2.6)
Merger transaction and integration costs (Note 2)	9.0	23.3	14.6	78.0
Total costs and expenses	2,777.6	3,490.1	5,663.5	6,832.3
Other income (expense), net	2.2	(50.3)	(23.0)	13.2
Income from equity affiliates (Note 9)	40.2	12.7	54.2	22.1
Income before net interest expense and income taxes	225.7	317.3	453.8	436.0
Net interest expense	(50.9)	(72.1)	(138.3)	(154.2)
Income before income taxes	174.8	245.2	315.5	281.8
Provision for income taxes (Note 16)	64.7	86.2	114.0	138.0
Net income	110.1	159.0	201.5	143.8
Net (income) loss attributable to noncontrolling interests	(4.4)	5.9	(0.7)	2.4
Net income attributable to TechnipFMC plc	$ 105.7	$ 164.9	$ 200.8	$ 146.2
Earnings per share attributable to TechnipFMC plc
Basic (usd per share)	$ 0.23	$ 0.35	$ 0.43	$ 0.31
Diluted (usd per share)	$ 0.23	$ 0.35	$ 0.43	$ 0.31
Weighted average shares outstanding (Note 6)
Basic (in shares)	461.4	466.7	462.8	466.7
Diluted (in shares)	463.3	468.4	464.2	468.2
Cash dividends declared per share (usd per share)	$ 0.13	$ 0	$ 0.26	$ 0
Services
Revenue:
Revenue	$ 2,243.9	$ 3,134.3	$ 4,671.3	$ 5,926.1
Products
Revenue:
Revenue	$ 663.7	$ 654.8	$ 1,312.1	$ 1,217.3