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Variable Interest Entities (Schedule of VIE Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Public Utilities, Property, Plant and Equipment, Net [1] $ 26,489.9 $ 25,453.9
Current assets [1] 2,184.6 2,080.2
Other Assets, Noncurrent 4,258.0 4,075.3
Total Assets 33,105.1 31,788.1
Current liabilities [2] 4,241.9 4,113.4
Asset retirement obligations 727.8 698.6
Finance lease obligations 336.7 313.0
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Finance Lease, Liability, Payment, Due 40.3 40.4
Consolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Public Utilities, Property, Plant and Equipment, Net 1,307.1 1,323.8
Current assets 62.0 65.0
Total Assets 1,369.1 1,388.8
Current liabilities 51.5 53.7
Asset retirement obligations 53.8 58.3
Total Liabilities $ 145.6 $ 152.4
[1] Includes $1,307.1 million and $1,323.8 million at March 31, 2025 and December 31, 2024, respectively, of net property, plant and equipment assets and $62.0 million and $65.0 million at March 31, 2025 and December 31, 2024, respectively, of current assets of consolidated VIEs that may be used only to settle obligations of the consolidated VIEs. Refer to Note 4, "Noncontrolling Interests," for additional information.
[2] Includes $51.5 million and $53.7 million at March 31, 2025 and December 31, 2024, respectively, of current liabilities and $53.8 million and $58.3 million at March 31, 2025 and December 31, 2024, respectively, of other liabilities, and finance leases of $40.3 million and $40.4 million at March 31, 2025 and December 31, 2024 respectively, of consolidated VIEs that creditors do not have recourse to our general credit. Refer to Note 4, "Noncontrolling Interests," for additional information.