Debt Instrument, Number Of Counterparties

No definition available.

Name:	fti_DebtInstrumentNumberOfCounterparties
Namespace Prefix:	fti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit, Accordion Feature, Maximum Borrowing Capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	fti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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DEBT - Credit Facilities and Debt (Details) $ in Millions	Sep. 05, 2025	Jun. 23, 2025 USD ($) dealer	Apr. 24, 2023 USD ($)	Feb. 16, 2021 USD ($)	Jun. 30, 2026 USD ($)
Commercial Paper \| Commercial Paper Dealer Agreements
Line of Credit Facility
Debt instrument, term		364 days
Number of counterparties \| dealer		2
Debt instrument face amount		$ 1,000.0
Revolving Credit Facility \| Term Benchmark loans
Line of Credit Facility
Debt instrument, basis spread on variable rate (percent)	1.25%
Revolving Credit Facility \| Base Rate
Line of Credit Facility
Debt instrument, basis spread on variable rate (percent)	0.25%
Revolving Credit Facility \| Letter of Credit
Line of Credit Facility
Letters of credit outstanding amount					$ 0.0
Line of credit facility borrowing capacity					$ 1,250.0
Revolving Credit Facility \| Line of Credit
Line of Credit Facility
Maximum borrowing capacity			$ 1,250.0	$ 1,000.0
Debt instrument, term			5 years	3 years
Debt issuance costs			$ 16.7
Revolving Credit Facility \| Letter of Credit
Line of Credit Facility
Maximum borrowing capacity			250.0	$ 450.0
Revolving Credit Facility \| Letter of Credit \| Five-Year Senior Secured Performance Letters of Credit
Line of Credit Facility
Maximum borrowing capacity			$ 500.0
Debt instrument, term			5 years
Maximum available commitments under accordion feature			$ 1,000.0