IndexForecast [Member]
| Name | ScenarioForecastMember |
|---|---|
| Namespace | http://fasb.org/srt/2021-01-31 |
| Prefix | srt |
| Data type | dtr-types:domainItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | True |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Forecast [Member] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Information reported for future period. Excludes information expected to be reported in future period for effect on historical fact. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
References
| Name | Value | Role |
|---|---|---|
| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Retirement Benefits:Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2020 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2019-10 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedReferences | true | http://fasb.org/srt/role/changeNote/changeNote |
| SourceName | Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2019 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2018-10 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedReferences | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedLabels | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedDocumentation | true | http://fasb.org/srt/role/changeNote/changeNote |
| PreviousDocumentation | The reporting scenario used to indicate financial results forecast for a future period. | http://fasb.org/srt/role/changeNote/changeNote |
| SourceName | Accounting Changes:Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2021 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2020-07 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedReferences | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedDocumentation | true | http://fasb.org/srt/role/changeNote/changeNote |
| PreviousDocumentation | Information reported for future period. | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2009/role/commonPracticeRef |
| Topic | 250 | http://www.xbrl.org/2009/role/commonPracticeRef |
| SubTopic | 10 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 50 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | 4 | http://www.xbrl.org/2009/role/commonPracticeRef |
| URI | http://asc.fasb.org/extlink&oid=124431687&loc=d3e22595-107794 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Publisher | SEC | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Regulation S-X (SX) | http://www.xbrl.org/2009/role/commonPracticeRef |
| Number | 210 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 11 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Subsection | 03 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Publisher | FASB | http://www.xbrl.org/2003/role/disclosureRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/disclosureRef |
| Topic | 715 | http://www.xbrl.org/2003/role/disclosureRef |
| SubTopic | 80 | http://www.xbrl.org/2003/role/disclosureRef |
| Section | 50 | http://www.xbrl.org/2003/role/disclosureRef |
| Paragraph | 5 | http://www.xbrl.org/2003/role/disclosureRef |
| Subparagraph | (f)(3) | http://www.xbrl.org/2003/role/disclosureRef |
| URI | http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 | http://www.xbrl.org/2003/role/disclosureRef |
Related Child Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | us-gaap:MultiemployerPlansMinimumContribution | dep-concept-deprecatedConcept | http://fasb.org/us-gaap/role/deprecated/deprecated |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
| srt:ScenarioUnspecifiedDomain | parent-child | http://fasb.org/us-gaap/role/statement/CommonDomainMembers |
| srt:ScenarioUnspecifiedDomain | domain-member | http://fasb.org/us-gaap/role/statement/CommonDomainMembersStatementTable |
| srt:ScenarioUnspecifiedDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/AccountingChangesAndErrorCorrections |
| srt:ScenarioUnspecifiedDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/AccountingChangesAndErrorCorrectionsNewAccountingPronouncementsOrChangeInAccountingPrincipleTable |
| srt:ScenarioUnspecifiedDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/AccountingChangesAndErrorCorrectionsScheduleOfChangeInAccountingEstimateTable |
| srt:ScenarioUnspecifiedDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsRetirementBenefits |
| srt:ScenarioUnspecifiedDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsRetirementBenefitsScheduleOfMultiemployerPlansTable |