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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Available-for-sale, securities $ 159.0 $ 86.7
Equity Securities, FV-NI 8.5  
Total 194.8 193.8
Liabilities    
Total 6.5 3.5
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 4.0 80.1
Fair Value, Inputs, Level 1    
Assets    
Risk management assets 0.0 0.0
Available-for-sale, securities 0.0 0.0
Equity Securities, FV-NI 8.5  
Total 12.5 80.1
Liabilities    
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 4.0 80.1
Significant Other Observable Inputs (Level 2)    
Assets    
Risk management assets 23.3 27.0
Available-for-sale, securities 159.0 86.7
Equity Securities, FV-NI 0.0  
Total 182.3 113.7
Liabilities    
Risk management liabilities 6.5 3.5
Total 6.5 3.5
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 0.0 0.0
Significant Unobservable Inputs (Level 3)    
Assets    
Risk management assets 0.0 0.0
Available-for-sale, securities 0.0 0.0
Equity Securities, FV-NI 0.0  
Total 0.0 0.0
Liabilities    
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 0.0 0.0
Available-for-sale Securities    
Assets    
Available-for-sale, securities 159.0 86.7
Risk management assets    
Assets    
Risk management assets 23.3 27.0
Liabilities    
Risk management liabilities $ 6.5 $ 3.5