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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Variable Interest Entities
Year Ended
(Dollars in millions)Dec 31, 2024Dec 31, 2023Dec 31, 2022
Cash distribution from Investment2.0 2.0 3.3 
Income (Loss) on Investments in Alternative Energy Partnership2.3 2.9 (19.9)
Income Tax Credits Recognized— 0.2 4.3 
Income Tax Expense (Benefit) Recognized from Alternative Energy Partnership0.5 0.7 (3.7)
(Dollars in millions)Dec 31, 2024Dec 31, 2023
Cash$2.7 $2.7 
Equipment, Net of Depreciation253.2 256.2 
Other Assets9.2 7.5 
Total Unconsolidated Assets265.0 266.4 
Maximum Loss Exposure17.6 17.3