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Risk Management Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 24.4	$ 13.2
Derivative Liability	144.2	222.8
Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Derivative Asset	10.6	10.4
Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Derivative Asset	13.8	2.8
Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Derivative Liability	136.8	78.2
Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Derivative Liability	7.4	144.6
Interest rate risk programs | Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Interest rate risk programs | Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Interest rate risk programs | Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Derivative Liability	136.4	70.9
Interest rate risk programs | Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	99.5
Commodity price risk programs | Risk Management Assets Current
Derivatives, Fair Value [Line Items]
Derivative Asset	10.6	10.4
Commodity price risk programs | Risk Management Assets Noncurrent
Derivatives, Fair Value [Line Items]
Derivative Asset	13.8	2.8
Commodity price risk programs | Risk Management Liabilities Current
Derivatives, Fair Value [Line Items]
Derivative Liability	0.4	7.3
Commodity price risk programs | Risk Management Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 7.4	$ 45.1

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