Litigation (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Loss Contingencies [Line Items]
Potential liabilities related to litigation and environmental matters	$ 33.6	$ 37.0	$ 34.7
Insurance Receivable	11.9	14.1	11.7
Regulatory Assets	$ 20.5	$ 21.2	$ 21.1