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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Public Utilities, Property, Plant and Equipment, Net [1] $ 20,227.6 $ 19,842.6
Current assets [1] 2,336.5 2,584.3
Other Assets, Noncurrent 4,062.7 4,085.5
Total Assets 26,853.7 26,736.6
Current liabilities [2] 3,906.9 4,660.5
Asset retirement obligations 464.7 478.1
Other noncurrent liabilities 298.5 296.8
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Public Utilities, Property, Plant and Equipment, Net 972.7 978.5
Current assets 33.8 25.7
Total Assets 1,006.5 1,004.2
Current liabilities 135.4 128.2
Asset retirement obligations 30.7 30.6
Total Liabilities $ 166.1 $ 158.8
[1] Includes $972.7 million and $978.5 million at March 31, 2023 and December 31, 2022, respectively, of net property, plant and equipment assets and $33.8 million and $25.7 million at March 31, 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 12, "Variable Interest Entities," for additional information.
[2] Includes $135.4 million and $128.2 million at March 31, 2023 and December 31, 2022, respectively, of current liabilities and $30.7 million and $30.6 million at March 31, 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 12, "Variable Interest Entities," for additional information.