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Revenues from Contracts with Customers - Disaggregation of Revenue by Identified Revenue Stream (Parenthetical) (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Brokered Natural Gas, Marketing and Other | Other marketing revenue |
Disaggregation of Revenue [Line Items] |
Revenue received as part of capital release agreement | $ 8.8

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- Definition Revenue received as part of capital release agreement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |