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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Assets    
Available-for-sale, securities $ 81.2 $ 86.7
Total 174.4 193.8
Liabilities    
Total 3.6 3.5
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 41.5 80.1
Fair Value, Inputs, Level 1    
Assets    
Risk management assets 0.0 0.0
Available-for-sale, securities 0.0 0.0
Total 41.5 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 41.5 80.1
Significant Other Observable Inputs (Level 2)    
Assets    
Risk management assets 51.7 27.0
Available-for-sale, securities 81.2 86.7
Total 132.9 113.7
Liabilities    
Risk management liabilities 3.6 3.5
Total 3.6 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
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 81.2 86.7
Risk management assets    
Assets    
Risk management assets 51.7 27.0
Liabilities    
Risk management liabilities $ 3.6 $ 3.5