Variable Interest Entities (Schedule of Net Income Attributable to Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Attributable to Noncontrolling Interest [Line Items]
Net loss attributable to noncontrolling interest	$ (11.2)	$ (3.4)	$ (6.7)	$ (2.4)
Rosewater
Income Attributable to Noncontrolling Interest [Line Items]
Net loss attributable to noncontrolling interest	(4.0)	$ (3.4)	(2.9)	(2.4)
Indiana Crossroads Wind
Income Attributable to Noncontrolling Interest [Line Items]
Net loss attributable to noncontrolling interest	$ (7.2)		$ (3.8)	$ 0.0

Amount of Net Income (Loss) attributable to noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124452729-227067

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration