v3.26.3
Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets    
Available-for-sale, securities $ 166.1 $ 146.1
Equity Securities, FV-NI 9.2 8.5
Total 185.9 173.4
Liabilities    
Total 13.1 5.9
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 9.2 8.5
Total 9.2 8.5
Liabilities    
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Assets    
Risk management assets 10.6 18.8
Available-for-sale, securities 166.1 146.1
Equity Securities, FV-NI 0.0 0.0
Total 176.7 164.9
Liabilities    
Risk management liabilities 13.1 5.9
Total 13.1 5.9
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 0.0
Total 0.0 0.0
Liabilities    
Risk management liabilities 0.0 0.0
Total 0.0 0.0
Available-for-sale Securities    
Assets    
Available-for-sale, securities 166.1 146.1
Risk management assets    
Assets    
Risk management assets 10.6 18.8
Liabilities    
Risk management liabilities $ 13.1 $ 5.9