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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | $ (1.7) |
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 4,900,000 | $ 5,500,000 | 14,700,000 | $ 16,400,000
Interest cost | 16,000,000.0 | 16,300,000 | 48,000,000.0 | 48,900,000
Expected return on assets | (23,100,000) | (23,800,000) | (69,300,000) | (71,400,000)
Amortization of prior service credit | 0 | 0 | 0 | 0
Recognized actuarial loss | 6,400,000 | 7,200,000 | 19,200,000 | 21,600,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 5,600,000 | 5,900,000 | 5,600,000 | 5,900,000
Total Net Periodic Benefits Cost | 9,800,000 | 11,100,000 | 18,200,000 | 21,400,000
Other Postretirement Benefit Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 1,000,000.0 | 1,300,000 | 3,000,000.0 | 3,900,000
Interest cost | 5,600,000 | 5,500,000 | 16,800,000 | 16,400,000
Expected return on assets | (4,200,000) | (4,000,000.0) | (12,600,000) | (12,000,000.0)
Amortization of prior service credit | (400,000) | (400,000) | (1,200,000) | (1,200,000)
Recognized actuarial loss | 400,000 | 800,000 | 1,200,000 | 2,400,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 0 | 0 |  | 0
Total Net Periodic Benefits Cost | $ 2,400,000 | $ 3,200,000 | $ 7,200,000 | $ 9,500,000

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