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Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2021 yr
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
RUPO maintenance contracts, number of additional years recognized | 3
Contract assets, incurred costs, billing and collection, period | 1 year
Minimum |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Customer payments on engineering and construction contracts, period until due | 30 days
Maximum |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Customer payments on engineering and construction contracts, period until due | 45 days

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- Definition Contract Assets, Incurred Costs, Billing and Collection, Period + References No definition available. + Details
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Namespace Prefix: | flr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue, Performance Obligation, Contractual Payments from Customer Paymetns + References No definition available. + Details
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Namespace Prefix: | flr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue Recognition, RUPO Maintenance Contracts, Number of Additional Years Recognized + References No definition available. + Details
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Namespace Prefix: | flr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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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- Details
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- Details
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