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Variable Interest Entities (Schedule of Noncontrolling Interest) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiaries	$ 329.5	$ 325.6
Rosewater
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiaries	88.8	88.2
Indiana Crossroads Wind
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest in consolidated subsidiaries	$ 240.7	$ 237.4

X

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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