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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ (33.6) | $ (35.8) | $ (33.6) | $ (37.1)
Other Comprehensive Income (Loss) before reclassifications | 3.8 | (2.2) | 2.7 | (1.6)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.2 | 1.1 | 1.3 | 1.8
Net current-period other comprehensive income (loss) | 4.0 | (1.1) | 4.0 | 0.2
Ending Balance | (29.6) | (36.9) | (29.6) | (36.9)
Interest Rate Risk |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net current-period other comprehensive income (loss) |  |  | (0.3) |
Gains and Losses on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (7.6) | (10.4) | (7.3) | (11.2)
Other Comprehensive Income (Loss) before reclassifications | 3.5 | (1.7) | 2.8 | (1.4)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0 | 0.4 | 0.5
Net current-period other comprehensive income (loss) | 3.5 | (1.7) | 3.2 | (0.9)
Ending Balance | (4.1) | (12.1) | (4.1) | (12.1)
Gains and Losses on Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (13.0) | (12.7) | (12.8) | (12.6)
Other Comprehensive Income (Loss) before reclassifications | 0.4 | (0.4) | 0.0 | (0.4)
Amounts reclassified from accumulated other comprehensive income (loss) | (0.5) | 0.3 | (0.3) | 0.2
Net current-period other comprehensive income (loss) | (0.1) | (0.1) |  | (0.2)
Ending Balance | (13.1) | (12.8) | (13.1) | (12.8)
Pension and OPEB Items |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (13.0) | (12.7) | (13.5) | (13.3)
Other Comprehensive Income (Loss) before reclassifications | (0.1) | (0.1) | (0.1) | 0.2
Amounts reclassified from accumulated other comprehensive income (loss) | 0.7 | 0.8 | 1.2 | 1.1
Net current-period other comprehensive income (loss) | 0.6 | 0.7 | 1.1 | 1.3
Ending Balance | $ (12.4) | $ (12.0) | $ (12.4) | $ (12.0)

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