| Standard label: | Payments for Investment in Restricted Cash from Pollution Control Bond |
| Name: | us-gaap:PaymentsForInvestmentInRestrictedCashFromPollutionControlBond |
| Documentation: | The cash outflow for investments in restricted cash from pollution control bond, which is a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PaymentsForInvestmentInRestrictedCashFromPollutionControlBond |
| Label | Role | Language |
| Payments for Investment in Restricted Cash from Pollution Control Bond | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 13 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| Part Of Roll Up: |
| us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |