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Significant Risks and Uncertainties (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |
Reduction of maximum loss due to counterparty credit risk by master netting provision | $ 44.2 |  |
Allowance for doubtful accounts | $ 0.1 | $ 0.0 |
Commercial Relationship [Member] | Consolidated Revenues [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of consolidated revenues | 11.00% | 12.00% | 15.00%
Maximum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Potential loss attributable to individual counterparties | $ 17.5 |  |
Minimum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Potential loss attributable to individual counterparties | $ 0.8 |  |

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