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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 4.9 | $ 5.5 | $ 9.8 | $ 10.9
Interest cost | 16.0 | 16.3 | 32.0 | 32.6
Expected return on assets | (23.1) | (23.8) | (46.2) | (47.6)
Amortization of prior service credit | 0.0 | 0.0 | 0.0 | 0.0
Recognized actuarial loss | 6.4 | 7.2 | 12.8 | 14.4
Total Net Periodic Benefits Cost | 4.2 | 5.2 | 8.4 | 10.3
Other Postretirement Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 1.0 | 1.3 | 2.0 | 2.6
Interest cost | 5.6 | 5.5 | 11.2 | 10.9
Expected return on assets | (4.2) | (4.0) | (8.4) | (8.0)
Amortization of prior service credit | (0.4) | (0.4) | (0.8) | (0.8)
Recognized actuarial loss | 0.4 | 0.8 | 0.8 | 1.6
Total Net Periodic Benefits Cost | $ 2.4 | $ 3.2 | $ 4.8 | $ 6.3

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