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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Variable Interest Entities
Year Ended
(Dollars in millions)Dec 31, 2023Dec 31, 2022Dec 31, 2021
Fundings$— $— $80.0 
Cash distribution from Investment2.0 3.3 0.5 
Income (Loss) on Investments in Alternative Energy Partnership2.9 (19.9)(61.2)
Income Tax Credits Recognized0.2 4.3 73.9 
Tax (Expense) Benefit Recognized from Alternative Energy Partnership(0.7)3.7 5.1 
(Dollars in millions)Dec 31, 2023Dec 31, 2022
Cash$2.7 $3.0 
Equipment, Net of Depreciation256.2 261.7 
Other Assets7.5 5.1 
Total Unconsolidated Assets266.4 269.7 
Maximum Loss Exposure17.3 16.3