Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Aggregate fair value of commodity derivative instruments	$ 8.1
Fair Value, Measurements, Recurring
Assets
Assets from price risk management	537.1	$ 728.9
SPH units	2.6	2.2
Total assets at fair value	539.7	731.1
Netting Agreements	(452.1)	(607.4)
Collateral/Margin Received or Paid	(12.2)	(79.4)
Fair Value	72.8	42.1
Total assets at fair value	75.4	44.3
Gross Liabilities From Price Risk Management With Credit-Risk-Related Contingent Features	485.8	662.0
Collateral Already Posted, Aggregate Fair Value	(25.6)	(2.8)
Assets Needed for Immediate Settlement, Aggregate Fair Value		57.4
Additional Collateral, Aggregate Fair Value	3.9	6.0
Derivative, Net Liability Position, Aggregate Fair Value, Without Credit-Risk Contingent Features	15.8	57.2
Gross Liabilities From Price Risk Management Without Credit-Risk-Related Contingent Features	11.9	51.2
Liabilities
Total liabilities at fair value	497.7	713.2
Netting Agreements	(452.1)	(607.4)
Collateral/Margin Received or Paid	(21.7)	(8.8)
Total liabilities at fair value	23.9	114.6
Fair Value, Measurements, Recurring \| Level 1
Assets
Assets from price risk management	62.8	33.3
SPH units	2.6	2.2
Total assets at fair value	65.4	35.5
Gross Liabilities From Price Risk Management With Credit-Risk-Related Contingent Features	65.7	26.9
Gross Liabilities From Price Risk Management Without Credit-Risk-Related Contingent Features	0.0	0.0
Liabilities
Total liabilities at fair value	65.7	26.9
Fair Value, Measurements, Recurring \| Level 2
Assets
Assets from price risk management	474.3	695.6
SPH units	0.0	0.0
Total assets at fair value	474.3	695.6
Gross Liabilities From Price Risk Management With Credit-Risk-Related Contingent Features	420.1	635.1
Gross Liabilities From Price Risk Management Without Credit-Risk-Related Contingent Features	11.9	51.2
Liabilities
Total liabilities at fair value	432.0	686.3
Fair Value, Measurements, Recurring \| Level 3
Assets
Assets from price risk management	0.0	0.0
SPH units	0.0	0.0
Total assets at fair value	0.0	0.0
Gross Liabilities From Price Risk Management With Credit-Risk-Related Contingent Features	0.0	0.0
Gross Liabilities From Price Risk Management Without Credit-Risk-Related Contingent Features	0.0	0.0
Liabilities
Total liabilities at fair value	$ 0.0	$ 0.0

Assets, Fair Value Disclosure, Excluding Netting Adjustments

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Liabilities, Fair Value Disclosure, Excluding Netting Adjustments

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The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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Fair value of securities received as collateral against derivative assets.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of securities pledged as collateral against derivative liabilities.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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Fair value of financial and nonfinancial obligations.

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Fair value as of the balance sheet date of price risk derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet.

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