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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Available-for-sale, securities | $ 150.4 | $ 151.6
Total | 201.9 | 236.4
Liabilities |  |
Total | 6.5 | 3.0
Fair Value, Inputs, Level 1 |  |
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
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Risk management assets | 51.5 | 84.8
Available-for-sale, securities | 150.4 | 151.6
Total | 201.9 | 236.4
Liabilities |  |
Risk management liabilities | 6.5 | 3.0
Total | 6.5 | 3.0
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
Available-for-sale Securities |  |
Assets |  |
Available-for-sale, securities | 150.4 | 151.6
Risk management assets |  |
Assets |  |
Risk management assets | 51.5 | 84.8
Liabilities |  |
Risk management liabilities | $ 6.5 | $ 3.0

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