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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
VIE Assets and Liabilities [Abstract]      
Net Property, Plant and Equipment $ 17,881.8 $ 16,619.5  
Current assets [1] 1,920.8 1,659.4  
Total Assets 24,156.9 22,040.5 $ 22,659.8
Current liabilities 2,746.2 2,279.4  
Asset retirement obligations 469.7 477.1  
Other noncurrent liabilities 690.2 515.5  
Rosewater      
VIE Assets and Liabilities [Abstract]      
Net Property, Plant and Equipment 170.1 175.6  
Current assets 6.2 1.7  
Total Assets 176.3 177.3  
Current liabilities 2.5 15.3  
Asset retirement obligations 5.7 5.5  
Other noncurrent liabilities 0.0 0.1  
Total liabilities 8.2 20.9  
Indiana Crossroads Wind      
VIE Assets and Liabilities [Abstract]      
Net Property, Plant and Equipment 525.8 0.0  
Current assets 8.1 0.0  
Total Assets 533.9 0.0  
Current liabilities 7.5 0.0  
Asset retirement obligations 14.8 0.0  
Other noncurrent liabilities 0.0 0.0  
Total liabilities $ 22.3 $ 0.0  
[1] (1)Includes $695.9 million and $175.6 million in 2021 and 2020, respectively, of net property, plant and equipment assets and $14.3 million and $1.7 million in 2021 and 2020, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 4, "Variable Interest Entities" for additional information.