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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Total | $ 172.1 | $ 184.1
Liabilities |  |
Total | 101.0 | 222.8
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 | 4.2 | 13.2
Available-for-sale securities | 167.9 | 170.9
Total | 172.1 | 184.1
Liabilities |  |
Risk management liabilities | 101.0 | 222.8
Total | 101.0 | 222.8
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 | 167.9 | 170.9
Risk management assets |  |
Assets |  |
Risk management assets | 4.2 | 13.2
Liabilities |  |
Risk management liabilities | $ 101.0 | $ 222.8

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