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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Current assets $ 1,871.9 [1] $ 1,920.8
Total Assets 24,365.5 24,156.9
Current liabilities 2,594.6 [2] 2,746.2
Asset retirement obligations 472.0 469.7
Other noncurrent liabilities 669.5 690.2
Rosewater    
Variable Interest Entity [Line Items]    
Net Property, Plant and Equipment 168.7 170.1
Current assets 8.8 6.2
Total Assets 177.5 176.3
Current liabilities 4.3 2.5
Asset retirement obligations 5.7 5.7
Total Liabilities 10.0 8.2
Indiana Crossroads Wind    
Variable Interest Entity [Line Items]    
Net Property, Plant and Equipment 521.7 525.8
Current assets 18.6 8.1
Total Assets 540.3 533.9
Current liabilities 12.4 7.5
Asset retirement obligations 14.9 14.8
Total Liabilities $ 27.3 $ 22.3
[1] Includes $690.4 million and $695.9 million at March 31, 2022 and December 31, 2021, respectively, of net property, plant and equipment assets and $27.4 million and $14.3 million at March 31, 2022 and December 31, 2021, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 12, "Variable Interest Entities" for additional information.
[2] Includes $16.7 million and $10.0 million at March 31, 2022 and December 31, 2021, respectively, of current liabilities and $20.6 million and $20.5 million at March 31, 2022 and December 31, 2021, respectively, of other liabilities of consolidated VIEs that creditors do not have recourse to our general credit. Refer to Note 12, "Variable Interest Entities," for additional information.