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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 84.8	$ 24.4
Derivative Liability	3.0	144.2
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	18.8	10.6
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.1	136.8
Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	66.0	13.8
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.9	7.4
Interest rate risk programs | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Interest rate risk programs | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	136.4
Interest rate risk programs | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Interest rate risk programs | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	0.0
Commodity price risk programs | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	18.8	10.6
Commodity price risk programs | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.1	0.4
Commodity price risk programs | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	66.0	13.8
Commodity price risk programs | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 1.9	$ 7.4

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