Equipment Related to Power Purchase Agreements and Fuel Delivered to Customers, net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Depreciation expense	$ 7.4	$ 7.9	$ 6.3
Impairment charge related to the tanks	10.2	$ 6.4
Cost Of Revenue, Fuel Delivered To Customers
Lessor, Lease, Description [Line Items]
Termination costs	$ 17.0
Minimum
Lessor, Lease, Description [Line Items]
Lease term	1 year
Maximum
Lessor, Lease, Description [Line Items]
Lease term	10 years