CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue
Lease revenue	$ 83.1	$ 52.4	$ 201.3	$ 157.5
Total revenue	2,056.9	1,733.0	5,746.5	5,006.0
Costs and expenses
Cost of lease revenue	57.5	36.8	143.0	120.0
Selling, general and administrative expense	183.8	151.9	487.7	454.6
Research and development expense	17.5	19.0	49.7	45.1
Impairment, restructuring and other expenses	4.3	6.9	10.0	15.1
Total costs and expenses	1,896.1	1,652.2	5,376.2	4,837.8
Other income (expense), net (Note 13)	(41.5)	(10.3)	(225.1)	33.5
Income from equity affiliates (Note 9)	20.6	13.8	35.9	23.5
Loss from investment in Technip Energies	0.0	0.0	0.0	(27.7)
Income before net interest expense and income taxes	139.9	84.3	181.1	197.5
Interest income	4.0	4.2	16.4	12.2
Interest expense	(30.7)	(35.1)	(92.1)	(104.7)
Loss on early extinguishment of debt	0.0	0.0	0.0	(29.8)
Income before income taxes	113.2	53.4	105.4	75.2
Provision for income taxes (Note 14)	19.5	42.7	100.2	91.0
Income (loss) from continuing operations	93.7	10.7	5.2	(15.8)
(Income) from continuing operations attributable to non-controlling interests	(3.7)	(5.7)	(2.0)	(19.4)
Income (loss) from continuing operations attributable to TechnipFMC plc	90.0	5.0	3.2	(35.2)
Loss from discontinued operations	0.0	(15.3)	0.0	(34.7)
Net income (loss) attributable to TechnipFMC plc	$ 90.0	$ (10.3)	$ 3.2	$ (69.9)
Earnings Per Share, Basic and Diluted [Abstract]
Earnings (loss) per share from continuing operations attributable to TechnipFMC plc Basic (usd per share)	$ 0.21	$ 0.01	$ 0.01	$ (0.08)
Earnings (loss) per share from continuing operations attributable to TechnipFMC plc Diluted (usd per share)	0.20	0.01	0.01	(0.08)
Earnings (loss) per share from discontinued operations attributable to TechnipFMC plc basic (usd per share)	0.00	(0.03)	0.00	(0.08)
Earnings (loss) per share from discontinued operations attributable to TechnipFMC plc diluted (usd per share)	0.00	(0.03)	0.00	(0.08)
Total earnings (loss) per share attributable to TechnipFMC plc Basic (usd per share)	0.21	(0.02)	0.01	(0.16)
Total earnings (loss) per share attributable to TechnipFMC plc Diluted (usd per share)	$ 0.20	$ (0.02)	$ 0.01	$ (0.16)
Weighted average shares outstanding (Note 5)
Basic (in shares)	436.9	450.1	439.7	451.1
Diluted (in shares)	450.3	458.1	452.9	451.1
Service revenue
Revenue
Revenue	$ 1,180.7	$ 902.0	$ 3,098.2	$ 2,773.6
Costs and expenses
Cost of product and service revenue	916.6	684.1	2,589.1	2,288.5
Products
Revenue
Revenue	793.1	778.6	2,447.0	2,074.9
Costs and expenses
Cost of product and service revenue	$ 716.4	$ 753.5	$ 2,096.7	$ 1,914.5