Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash provided (required) by operating activities
Net income (loss)	$ 14.4	$ (3,237.9)	$ (2,412.1)
Income (loss) from discontinued operations, net of income taxes	72.6	(280.2)	(238.0)
Adjustments to reconcile net loss to cash provided (required) by operating activities
Depreciation	291.3	308.7	363.0
Amortization	94.1	103.4	104.7
Impairments (Note 20)	49.1	3,273.8	2,480.3
Employee benefit plan and share-based compensation costs	34.3	36.4	48.6
Deferred income tax provision (benefit), net	(95.1)	(31.8)	27.9
Income from investment in Technip Energies	(322.2)	0.0	0.0
Unrealized loss (gain) on derivative instruments and foreign exchange	30.8	(13.3)	22.4
Loss from equity affiliates, net of dividends received	(0.6)	(58.2)	(58.9)
Loss on early extinguishment of debt	61.9	0.0	0.0
Other	(5.5)	(32.7)	(97.1)
Changes in operating assets and liabilities, net of effects of acquisitions
Trade receivables, net and contract assets	(73.1)	433.4	(142.5)
Inventories, net	197.7	87.4	(173.3)
Accounts payable, trade	93.8	(236.4)	(56.1)
Contract liabilities	0.9	(61.8)	352.0
Income taxes payable (receivable), net	214.7	(56.1)	(31.1)
Other current assets and liabilities, net	63.5	551.2	142.0
Other non-current assets and liabilities, net	(7.6)	(13.5)	25.9
Cash provided by operating activities from continuing operations	715.0	772.4	357.7
Cash provided (required) by operating activities from discontinued operations	66.3	(115.5)	490.8
Cash provided by operating activities	781.3	656.9	848.5
Cash provided (required) by investing activities
Capital expenditures	(191.7)	(256.1)	(412.7)
Payment to acquire debt securities	(29.1)	(3.9)	(71.6)
Proceeds from sale of debt securities	27.4	51.5	18.9
Acquisitions, net of cash acquired	(15.3)	0.0	16.0
Proceeds from sale of assets	104.6	45.5	7.4
Proceeds from sales of investment in Technip Energies	900.9	0.0	0.0
Proceeds from repayment of advance to joint venture	25.0	26.7	62.0
Other	0.0	15.5	1.5
Cash provided (required) by investing activities from continuing operations	821.8	(120.8)	(378.5)
Cash required by investing activities from discontinued operations	(4.5)	(59.8)	(41.3)
Cash provided (required) by investing activities	817.3	(180.6)	(419.8)
Cash required by financing activities
Net decrease in short-term debt	(62.0)	(31.9)	(49.6)
Net increase (decrease) in commercial paper	(974.3)	(340.9)	113.3
Proceeds from issuance of long-term debt	1,164.4	223.2	96.2
Repayments of long-term debt	(1,462.2)	(423.9)	0.0
Payments for debt issuance cost	(60.4)	0.0	0.0
Purchase of ordinary shares	0.0	0.0	(92.7)
Dividends paid	0.0	(59.2)	(232.8)
Acquisition of non-controlling interest	(48.6)	0.0	0.0
Other	(4.2)	(19.2)	0.0
Cash required by financing activities from continuing operations	(1,447.3)	(651.9)	(165.6)
Cash required by financing activities from discontinued operations	(3,617.7)	(430.3)	(618.8)
Cash required by financing activities	(5,065.0)	(1,082.2)	(784.4)
Effect of changes in foreign exchange rates on cash and cash equivalents	(14.0)	223.5	5.9
Decrease in cash and cash equivalents	(3,480.4)	(382.4)	(349.8)
Cash and cash equivalents in the statement of cash flows, beginning of year	4,807.8	5,190.2	5,540.0
Cash and cash equivalents in the statement of cash flows, end of year	1,327.4	4,807.8	5,190.2
Supplemental disclosures of cash flow information attributable to continuing operations
Cash paid for interest (net of interest capitalized)	104.1	96.0	91.5
Cash paid for income taxes (net of refunds received)	25.1	107.8	104.2
Cash and cash equivalents	1,327.4	1,269.2	1,563.1
Cash and cash equivalents attributable to discontinued operations	0.0	3,538.6	3,627.1
Total cash and cash equivalents in the statement of cash flows	$ 1,327.4	$ 4,807.8	$ 5,190.2