Debt (Narrative) (Details) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Revolving Credit Facility Maturing On September Two Thousand Twenty
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date	Sep. 24, 2015
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000.0
Debt Instrument, Term	5 years
Line of Credit Facility, Expiration Date	Sep. 24, 2020
Conditional Increase In Maximum Borrowing Capacity Under Line Of Credit Facility	$ 500.0
Revolving Credit Facility Maturing On March Two Thousand Seventeen
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500.0
Debt Instrument, Term	5 years
Minimum \| Base Rate Loans \| Revolving Credit Facility Maturing On September Two Thousand Twenty
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Minimum \| LIBOR Loans \| Revolving Credit Facility Maturing On September Two Thousand Twenty
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Maximum \| Base Rate Loans \| Revolving Credit Facility Maturing On September Two Thousand Twenty
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Maximum \| LIBOR Loans \| Revolving Credit Facility Maturing On September Two Thousand Twenty
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%

Conditional Increase In Maximum Borrowing Capacity Under Line Of Credit Facility

No definition available.

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

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility first became available, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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_
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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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