Litigation (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Loss Contingencies [Line Items]
Potential liabilities related to litigation and environmental matters	$ 28.2	$ 37.0	$ 30.8
Insurance Receivable	5.9	14.1	6.9
Regulatory Assets	$ 20.9	$ 21.2	$ 21.2