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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Available-for-sale, securities | $ 157.8 | $ 171.8
Total | 294.0 | 196.2
Liabilities |  |
Total | 3.6 | 144.2
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 | 136.2 | 24.4
Available-for-sale, securities | 157.8 | 171.8
Total | 294.0 | 196.2
Liabilities |  |
Risk management liabilities | 3.6 | 144.2
Total | 3.6 | 144.2
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 | 157.8 | 171.8
Risk management assets |  |
Assets |  |
Risk management assets | 136.2 | 24.4
Liabilities |  |
Risk management liabilities | $ 3.6 | $ 144.2

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