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Derivative Instruments - Notional Amounts of Derivative Instruments (Details) - Mcf Mcf in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Commodity Member
Derivative [Line Items]
Notional amount	1,515.8	1,484.4
Basis Swap
Derivative [Line Items]
Notional amount	1,166.1	1,056.6

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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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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Details

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Namespace Prefix:
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X

- Details

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Period Type: