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Derivative Instruments Notional Amounts of Derivative Instruments (Details) - Mcf Mcf in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Natural Gas Commodity Swaps (Bcf) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | 1,460.6 | 1,484.4
Natural Gas Basis Swaps (Bcf) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | 1,290.4 | 1,056.6

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