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Variable Interest Entities (Schedule of Net Income Attributable to Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Attributable to Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interest	$ 4.5	$ 1.0
Rosewater
Income Attributable to Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interest	1.1	1.0
Indiana Crossroads Wind
Income Attributable to Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interest	$ 3.4	$ 0.0

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Income Attributable to Noncontrolling Interest [Line Items]

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

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