Revenue - Impact on Primary Financial Statements - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Service revenue	$ 2,427.4	$ 2,791.8
Product revenue	648.4	562.5
Lease and other revenue	49.4	33.7
Total revenue	3,125.2	3,388.0
Costs and expenses:
Cost of service revenue	1,952.5	2,377.6
Cost of product revenue	534.8	577.7
Cost of lease and other revenue	37.3	25.0
Selling, general and administrative expense	303.1	254.1
Research and development expense	41.1	43.4
Impairment, restructuring and other expenses	11.5	9.7
Merger transaction and integration costs	5.6	54.7
Total costs and expenses	2,885.9	3,342.2
Other income (expense), net	(25.2)	63.5
Income from equity affiliates	14.0	9.4
Income before net interest expense and income taxes	228.1	118.7
Net interest expense	(87.4)	(82.1)
Income before income taxes	140.7	36.6
Provision for income taxes	49.3	51.8
Net income (loss)	91.4	(15.2)
Net (income) loss attributable to noncontrolling interests	3.7	(3.5)
Net income (loss) attributable to TechnipFMC plc	95.1	(18.7)
Assets
Cash and cash equivalents	6,220.6	$ 7,041.7	$ 6,737.4	$ 6,269.3
Trade receivables, net	2,444.0		1,484.4
Contract assets	1,470.1		1,755.5
Inventories, net	1,036.8		987.0
Derivative financial instruments	104.6		78.3
Income taxes receivable	319.0		337.0
Advances paid to suppliers	424.7		391.3
Other current assets	1,153.7		1,206.2
Total current assets	13,173.5		12,977.1
Investments in equity affiliates	287.1		272.5
Property, plant and equipment, net of accumulated depreciation	3,900.3		3,871.5
Goodwill	9,012.2		8,929.8
Intangible assets, net of accumulated amortization	1,301.6		1,333.8
Deferred income taxes	480.2		454.7
Derivative financial instruments	74.5		94.9
Other assets	298.4		329.4
Total assets	28,527.8		28,263.7
Liabilities and equity
Less: current borrowings	87.2		77.1
Accounts payable, trade	3,729.2		3,958.7
Contract liabilities	3,914.2		3,314.2
Accrued payroll	401.8		402.2
Derivative financial instruments	63.2		69.0
Income taxes payable	233.0		320.3
Other current liabilities	1,842.1		1,687.9
Total current liabilities	10,270.7		9,829.4
Long-term debt, less current portion	3,735.8		3,777.9
Accrued pension and other post-retirement benefits, less current portion	266.2		282.0
Derivative financial instruments	52.7		68.1
Deferred income taxes	412.7		419.7
Other liabilities	507.9		477.2
Commitments and contingent liabilities
Stockholders’ equity
Ordinary shares	462.2		465.1
Ordinary shares held in employee benefit trust	(4.0)		(4.8)
Capital in excess of par value of ordinary shares	10,429.3		10,483.3
Retained earnings	3,369.5		3,448.0
Accumulated other comprehensive loss	(991.9)		(1,003.7)
Total TechnipFMC plc stockholders’ equity	13,265.1		13,387.9
Noncontrolling interests	16.7		21.5
Total equity	13,281.8		13,409.4
Total liabilities and equity	28,527.8		$ 28,263.7
Difference between revenue guidance in effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue:
Service revenue	(32.6)
Product revenue	(3.6)
Lease and other revenue	0.0
Total revenue	(36.2)
Costs and expenses:
Cost of service revenue	(13.9)
Cost of product revenue	(3.0)
Cost of lease and other revenue	0.0
Selling, general and administrative expense	0.0
Research and development expense	0.0
Impairment, restructuring and other expenses	0.0
Merger transaction and integration costs	0.0
Total costs and expenses	(16.9)
Other income (expense), net	0.0
Income from equity affiliates	0.0
Income before net interest expense and income taxes	(19.3)
Net interest expense	0.0
Income before income taxes	(19.3)
Provision for income taxes	(5.2)
Net income (loss)	(14.1)
Net (income) loss attributable to noncontrolling interests	0.1
Net income (loss) attributable to TechnipFMC plc	(14.0)
Assets
Cash and cash equivalents	0.0
Trade receivables, net	(846.3)
Contract assets	356.5
Inventories, net	28.3
Derivative financial instruments	0.0
Income taxes receivable	0.7
Advances paid to suppliers	0.0
Other current assets	0.0
Total current assets	(460.8)
Investments in equity affiliates	0.0
Property, plant and equipment, net of accumulated depreciation	0.0
Goodwill	0.0
Intangible assets, net of accumulated amortization	0.0
Deferred income taxes	(23.8)
Derivative financial instruments	0.0
Other assets	1.0
Total assets	(483.6)
Liabilities and equity
Less: current borrowings	0.0
Accounts payable, trade	20.1
Contract liabilities	(549.7)
Accrued payroll	0.0
Derivative financial instruments	0.0
Income taxes payable	(2.0)
Other current liabilities	(26.7)
Total current liabilities	(558.3)
Long-term debt, less current portion	0.0
Accrued pension and other post-retirement benefits, less current portion	0.0
Derivative financial instruments	0.0
Deferred income taxes	(2.6)
Other liabilities	0.0
Commitments and contingent liabilities
Stockholders’ equity
Ordinary shares	0.0
Ordinary shares held in employee benefit trust	0.0
Capital in excess of par value of ordinary shares	0.0
Retained earnings	77.5
Accumulated other comprehensive loss	0.0
Total TechnipFMC plc stockholders’ equity	77.5
Noncontrolling interests	(0.2)
Total equity	77.3
Total liabilities and equity	(483.6)
Calculated under revenue guidance in effect before Topic 606
Revenue:
Service revenue	2,394.8
Product revenue	644.8
Lease and other revenue	49.4
Total revenue	3,089.0
Costs and expenses:
Cost of service revenue	1,938.6
Cost of product revenue	531.8
Cost of lease and other revenue	37.3
Selling, general and administrative expense	303.1
Research and development expense	41.1
Impairment, restructuring and other expenses	11.5
Merger transaction and integration costs	5.6
Total costs and expenses	2,869.0
Other income (expense), net	(25.2)
Income from equity affiliates	14.0
Income before net interest expense and income taxes	208.8
Net interest expense	(87.4)
Income before income taxes	121.4
Provision for income taxes	44.1
Net income (loss)	77.3
Net (income) loss attributable to noncontrolling interests	3.8
Net income (loss) attributable to TechnipFMC plc	81.1
Assets
Cash and cash equivalents	6,220.6
Trade receivables, net	1,597.7
Contract assets	1,826.6
Inventories, net	1,065.1
Derivative financial instruments	104.6
Income taxes receivable	319.7
Advances paid to suppliers	424.7
Other current assets	1,153.7
Total current assets	12,712.7
Investments in equity affiliates	287.1
Property, plant and equipment, net of accumulated depreciation	3,900.3
Goodwill	9,012.2
Intangible assets, net of accumulated amortization	1,301.6
Deferred income taxes	456.4
Derivative financial instruments	74.5
Other assets	299.4
Total assets	28,044.2
Liabilities and equity
Less: current borrowings	87.2
Accounts payable, trade	3,749.3
Contract liabilities	3,364.5
Accrued payroll	401.8
Derivative financial instruments	63.2
Income taxes payable	231.0
Other current liabilities	1,815.4
Total current liabilities	9,712.4
Long-term debt, less current portion	3,735.8
Accrued pension and other post-retirement benefits, less current portion	266.2
Derivative financial instruments	52.7
Deferred income taxes	410.1
Other liabilities	507.9
Commitments and contingent liabilities
Stockholders’ equity
Ordinary shares	462.2
Ordinary shares held in employee benefit trust	(4.0)
Capital in excess of par value of ordinary shares	10,429.3
Retained earnings	3,447.0
Accumulated other comprehensive loss	(991.9)
Total TechnipFMC plc stockholders’ equity	13,342.6
Noncontrolling interests	16.5
Total equity	13,359.1
Total liabilities and equity	$ 28,044.2