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Derivative Instruments Notional Amounts of Derivative Instruments (Details) - Mcf Mcf in Millions	12 Months Ended
	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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Nominal volume used to calculate payments on a derivative instrument.

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