Risk Management (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Cash collateral (paid) received, net	$ (2.8)	$ (11.4)
Commodity contract
Derivative [Line Items]
Cash collateral (paid) received, net	(11.7)	(1.5)
Commodity contract with credit contingent features
Derivative [Line Items]
Aggregate fair value of commodity derivative instruments	53.9	57.9
Variation Margin-Related Net Derivative Asset Position
Derivative [Line Items]
Broker-related net derivative asset position	67.4	104.8
Variation Margin-Related Cash Collateral Received
Derivative [Line Items]
Broker-related cash collateral received	$ 45.6	$ 76.8

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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-Publisher FASB
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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

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-Publisher FASB
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-Publisher FASB
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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.

+ References

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-Publisher FASB
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- Definition

The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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