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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Total | $ 172.8 | $ 158.6
Liabilities |  |
Total | 326.6 | 146.6
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 | 28.2 | 4.4
Available-for-sale securities | 144.6 | 154.2
Total | 172.8 | 158.6
Liabilities |  |
Risk management liabilities | 326.6 | 146.6
Total | 326.6 | 146.6
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 | 144.6 | 154.2
Risk management assets |  |
Assets |  |
Risk management assets | 28.2 | 4.4
Liabilities |  |
Risk management liabilities | $ 326.6 | $ 146.6

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