Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash provided by operating activities
Net income (loss)	$ 51.9	$ (81.8)	$ 14.4
Net loss from discontinued operations	0.0	45.3	72.6
Adjustments to reconcile net income (loss) to cash provided by operating activities
Depreciation and amortization	377.8	377.2	385.4
Impairments	1.7	4.7	49.1
Employee benefit plan and share-based compensation costs	30.8	33.5	34.3
Deferred income tax benefit	(54.2)	(13.0)	(95.1)
(Income) loss from investment in Technip Energies	0.0	27.7	(322.2)
Unrealized loss on derivative instruments and foreign exchange	29.6	54.0	30.8
Income from equity affiliates, net of dividends received	(34.2)	(31.9)	(0.6)
Loss on early extinguishment of debt	0.0	29.8	61.9
Other	40.7	6.7	(5.5)
Changes in operating assets and liabilities, net of effects of acquisitions
Trade receivables, net and contract assets	(227.7)	(160.2)	(73.1)
Inventories, net	(91.2)	(35.0)	197.7
Accounts payable, trade	62.5	52.1	93.8
Contract liabilities	321.0	164.5	0.9
Income taxes payable (receivable), net	34.3	(62.1)	214.7
Other current assets and liabilities, net	203.3	(40.4)	63.5
Other non-current assets and liabilities, net	(53.3)	(19.0)	(7.6)
Cash provided by operating activities from continuing operations	693.0	352.1	715.0
Cash provided by operating activities from discontinued operations	0.0	0.0	66.3
Cash provided by operating activities	693.0	352.1	781.3
Cash provided (required) by investing activities
Capital expenditures	(225.2)	(157.9)	(191.7)
Proceeds from sale of assets	84.7	30.2	104.6
Proceeds from sales of investment in Technip Energies	0.0	288.5	900.9
Other	14.9	1.4	8.0
Cash provided (required) by investing activities from continuing operations	(125.6)	162.2	821.8
Cash required by investing activities from discontinued operations	0.0	0.0	(4.5)
Cash provided (required) by investing activities	(125.6)	162.2	817.3
Cash required by financing activities
Decrease in short-term debt	(341.6)	(200.4)	(62.0)
Cash settlement for derivative hedging debt	(30.1)	(80.5)	0.0
Net decrease in commercial paper	0.0	0.0	(974.3)
Proceeds from issuance of long-term debt	0.0	60.9	1,164.4
Repayments of long-term debt	0.0	(451.7)	(1,462.2)
Payments for debt issuance cost	(16.7)	0.0	(60.4)
Share repurchases	(205.1)	(100.2)	0.0
Dividends paid	(43.5)	0.0	0.0
Acquisition of non-controlling interest	0.0	0.0	(48.6)
Other	(19.5)	(24.8)	(4.2)
Cash required by financing activities from continuing operations	(656.5)	(796.7)	(1,447.3)
Cash required by financing activities from discontinued operations	0.0	0.0	(3,617.7)
Cash required by financing activities	(656.5)	(796.7)	(5,065.0)
Effect of changes in foreign exchange rates on cash and cash equivalents	(16.3)	12.1	(14.0)
Decrease in cash and cash equivalents	(105.4)	(270.3)	(3,480.4)
Cash and cash equivalents in the statement of cash flows, beginning of year	1,057.1	1,327.4	4,807.8
Cash and cash equivalents in the statement of cash flows, end of year	951.7	1,057.1	1,327.4
Supplemental disclosures of cash flow information attributable to continuing operations
Cash paid for interest (net of interest capitalized)	93.4	109.2	104.1
Cash paid for income taxes (net of refunds received)	150.7	189.2	25.1
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Dividend receivable in exchange for loan receivable	$ 85.0	$ 0.0	$ 0.0