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Variable Interest Entities (Schedule of Noncontrolling Interest) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Redeemable Noncontrolling Interest [Line Items] |  |
Noncontrolling interest in consolidated subsidiaries | $ 311.8 | $ 325.6
Rosewater |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Noncontrolling interest in consolidated subsidiaries | 82.4 | 88.2
Indiana Crossroads Wind |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Noncontrolling interest in consolidated subsidiaries | $ 229.4 | $ 237.4

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