Variable Interest Entities (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Rate MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Wind Power Purchase Agreement, Purchase Percentage \| Rate	100.00%
Payment to renewable generation asset developer \| $	$ 323.9	$ 240.4	$ 85.3
Rosewater
Variable Interest Entity [Line Items]
Nameplate Capacity	102
Indiana Crossroads Wind
Variable Interest Entity [Line Items]
Nameplate Capacity	302
Indiana Crossroads Solar
Variable Interest Entity [Line Items]
Nameplate Capacity	200