Long-Term Deposit (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Storey County [Member]
Costs Incurred, Development of Property, Plant And Equipment, In Long-Term Deposits [Line Items]
Costs subject to reimbursement	$ 2.2
NV Energy [Member]
Costs Incurred, Development of Property, Plant And Equipment, In Long-Term Deposits [Line Items]
Costs subject to reimbursement	$ 1.1	$ 3.2

[Line Items] for Costs Incurred, Development of Property, Plant And Equipment, In Long-Term Deposits [Table]

No definition available.

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Balance Type:	na
Period Type:	duration