Decoupling Filings (Details) - Subsidiaries [Member] - Decoupling Mechanism [Member] - USD ($) $ in Millions		12 Months Ended
	Dec. 19, 2017	Dec. 31, 2021	Dec. 31, 2020
Electricity, US Regulated [Member]
Regulatory Assets [Line Items]
Contract with Customer, Liability, Revenue Recognized		$ 3.0	$ 8.0
Electricity, US Regulated [Member] | Maximum
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Percentage	3.00%
Natural Gas [Member]
Regulatory Assets [Line Items]
Contract with Customer, Liability, Revenue Recognized		$ 0.0	$ 0.0
Natural Gas [Member] | Maximum
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Percentage	5.00%