| Disclosure Descriptive Information |
| Label: | Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns, Reconcilation [Roll Forward] |
| Name: | UnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward |
| Parent Topic: | IncomeTaxes |
| Documentation: | Roll forward (movements, changes) in unrecognized tax benefits excluding amounts pretaining to examined tax returns. |
| Commentary: | |
| Status: | |
| US GAAP XBRL Taxonomy Text Block: | us-gaap:ScheduleOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForwardTableTextBlock |
| Human Readable Examples: | List of human readable examples |
| Machine Readable Examples: | List of machine readable examples |
| Business rules (machine readable): | XBRL Definition Relations |
| US GAAP XBRL Taxonomy Network: | http://fasb.org/us-gaap/role/disclosure/IncomeTaxes | XML | HTML |
| References to Accounting Standards Codification (ASC) |
| Item | Description | Reference |
|---|---|---|
| 1 | FASB: Topic:740 Subtopic:10 Section:50 Paragraph:15A | http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 |
| Example Disclosure |
| Prototype of Disclosure |
| Line | Label | Object Class (Data type) | Period Type | Balance | Report Element Name |
|---|---|---|---|---|---|
| 1 | Reconciliation of the beginning and ending amounts of unrecognized tax benefits | Abstract | us-gaap:ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward | ||
| 2 | Balance, at beginning of the period | Concept (Monetary) | As Of | Credit | us-gaap:UnrecognizedTaxBenefits |
| 3 | Additions based on tax positions related to the current year | Concept (Monetary) | For Period | Credit | us-gaap:UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
| 4 | Additions for tax positions of prior years | Concept (Monetary) | For Period | Credit | us-gaap:UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
| 5 | Reductions for tax positions of prior years | Concept (Monetary) | For Period | Debit | us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |
| 6 | Reductions due to lapse in statute of limitations | Concept (Monetary) | For Period | Debit | us-gaap:UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |
| 7 | Settlements | Concept (Monetary) | For Period | Debit | us-gaap:UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |
| 8 | Balance at end of the period | Concept (Monetary) | As Of | Credit | us-gaap:UnrecognizedTaxBenefits |
| Business Rules Summary |
| From | Arcrole (predicate) | To |
|---|---|---|
| disclosures:UnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward | rules-arcroles:disclosure-equivalentTextblock | us-gaap:ScheduleOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForwardTableTextBlock |
| disclosures:UnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward | rules-arcroles:disclosure-hasConceptArrangementPattern | fro:RollForward |
| disclosures:UnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward | rules-arcroles:disclosure-requiresConcept | us-gaap:UnrecognizedTaxBenefits |
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