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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service Cost | $ 7.5 |  |  | $ 8.1 | $ 22.6 | $ 24.1
Interest cost | 7.9 |  |  | 13.1 | 23.5 | 40.1
Expected return on assets | (25.2) |  |  | (28.3) | (76.3) | (85.1)
Amortization of prior service credit | 0.0 |  |  | 0.2 | 0.0 | 0.6
Recognized actuarial loss | 5.5 |  |  | 8.6 | 16.3 | 26.0
Settlement loss | (2.9) | $ (3.3) | $ (3.3) | (8.0) | (9.5) | (8.0)
Total Net Periodic Benefits Cost | (1.4) |  |  | 9.7 | (4.4) | 13.7
Other Postretirement Benefit Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Service Cost | 1.5 |  |  | 1.7 | 4.5 | 4.9
Interest cost | 2.5 |  |  | 3.8 | 7.5 | 11.6
Expected return on assets | (3.8) |  |  | (3.6) | (11.4) | (10.8)
Amortization of prior service credit | (0.6) |  |  | (0.4) | (1.8) | (1.4)
Recognized actuarial loss | 1.2 |  |  | 1.2 | 3.6 | 3.8
Settlement loss | 0.0 |  |  | 0.0 | 0.0 | 0.0
Total Net Periodic Benefits Cost | $ 0.8 |  |  | $ 2.7 | $ 2.4 | $ 8.1

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