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Description of Business (Details)	12 Months Ended
	Dec. 31, 2020 project segment
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of reportable segments | segment	6
NuScale
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of projects | project	2

X

- Definition

Number of Projects

+ References

No definition available.

+ Details

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Namespace Prefix:	flr_
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Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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- Details

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