Commitments and Contingencies (Details) MMBTU in Millions	Apr. 23, 2019 MMBTU
Minimum
Subsidiary, Sale of Stock [Line Items]
Each cargo quantity (in MMBtu)	3.3
Maximum
Subsidiary, Sale of Stock [Line Items]
Each cargo quantity (in MMBtu)	3.6

Energy volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentMinimumEnergyVolumeRequired
Namespace Prefix:	us-gaap_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration