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Revenues from Contracts with Customers - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) Stream | Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Net brokered margin gain (loss) | $ (6.7) | $ (7.0) |
Number of revenue streams | Stream |  | 3 |
Revenue Contract with Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable | $ 354.4 | $ 354.4 | $ 305.7

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- Definition Revenue less expenses related to brokering natural gas. The entity realizes a brokered margin as a result of buying and selling natural gas in back to back transactions. + References No definition available. + Details
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