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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Public Utilities, Property, Plant and Equipment, Net [1] $ 21,175.2 $ 19,842.6
Current assets [1] 1,856.9 2,584.3
Other Assets, Noncurrent 4,074.4 4,085.5
Total Assets 27,343.7 26,736.6
Current liabilities [2] 4,091.2 4,660.5
Asset retirement obligations 480.9 478.1
Other noncurrent liabilities 294.6 296.8
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Public Utilities, Property, Plant and Equipment, Net 1,349.7 978.5
Current assets 160.4 25.7
Total Assets 1,510.1 1,004.2
Current liabilities 344.5 128.2
Asset retirement obligations 54.4 30.6
Total Liabilities $ 398.9 $ 158.8
[1] Includes $1,349.7 million and $978.5 million at June 30, 2023 and December 31, 2022, respectively, of net property, plant and equipment assets and $160.4 million and $25.7 million at June 30, 2023 and December 31, 2022, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 13, "Variable Interest Entities," for additional information.
[2] Includes $344.5 million and $128.2 million at June 30, 2023 and December 31, 2022, respectively, of current liabilities and $54.4 million and $30.6 million at June 30, 2023 and December 31, 2022, respectively, of other liabilities of consolidated VIEs that creditors do not have recourse to our general credit. Refer to Note 13, "Variable Interest Entities," for additional information.