Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash provided (required) by operating activities
Net income	$ 201.5	$ 143.8
Adjustments to reconcile net income (loss) to cash provided (required) by operating activities
Depreciation	179.6	183.3
Amortization	90.9	127.4
Employee benefit plan and share-based compensation costs	15.9	16.2
Deferred income tax provision (benefit), net	(36.2)	(49.7)
Unrealized loss (gain) on derivative instruments and foreign exchange	31.5	(36.1)
Impairments	12.5	0.8
Income from equity affiliates, net of dividends received	(51.8)	(19.8)
Other	51.0	8.4
Changes in operating assets and liabilities, net of effects of acquisitions
Trade receivables, net and contract assets	(173.6)	715.1
Inventories, net	(154.2)	190.2
Accounts payable, trade	(912.1)	(245.3)
Contract liabilities	308.1	(376.2)
Income taxes payable (receivable), net	(77.4)	(82.4)
Other assets and liabilities, net	29.1	(281.4)
Cash provided (required) by operating activities	(485.2)	294.3
Cash provided (required) by investing activities
Capital expenditures	(134.8)	(107.5)
Cash acquired in merger of FMC Technologies, Inc. and Technip S.A.		1,479.2
Acquisitions, net of cash acquired	(103.4)
Cash divested from deconsolidation	1.7
Proceeds from sale of assets	6.2	3.3
Other	(5.4)	11.8
Cash provided (required) by investing activities	(235.7)	1,386.8
Cash required by financing activities
Net decrease in short-term debt	(22.4)	(16.7)
Net increase (decrease) in commercial paper	83.7	(98.2)
Proceeds from issuance of long-term debt	2.5	5.6
Repayments of long-term debt		(554.6)
Payments related to taxes withheld on share-based compensation		(46.6)
Purchase of treasury shares	(226.3)
Dividends paid	(120.2)	0.0
Settlements of mandatorily redeemable financial liability	(124.2)	(76.6)
Other	1.0	1.9
Cash required by financing activities	(405.9)	(785.2)
Effect of changes in foreign exchange rates on cash and cash equivalents	(55.2)	13.9
Increase (decrease) in cash and cash equivalents	(1,182.0)	909.8
Cash and cash equivalents, beginning of period	6,737.4	6,269.3
Cash and cash equivalents, end of period	$ 5,555.4	$ 7,179.1