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v3.23.3

Defined Benefit and Postretirement Benefits (Components Of Net Periodic Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ (0.2) | $ 1.7 | $ 2.4 | $ 4.3
Interest cost | 7.8 | 6.9 | 26.7 | 17.4
Expected return on plan assets | (9.8) | (15.7) | (34.2) | (43.6)
Amortization of prior service cost (benefit) | 0.5 | 0.0 | 0.5 | (0.1)
Amortization of net loss (benefit) | 3.9 | 3.3 | 11.5 | 12.9
Curtailment and Settlement loss from discontinued operations |  |  | 1.9 | 0.0
Net periodic cost | 2.2 | (3.8) | 8.8 | (9.1)
Pension | Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic cost |  |  | 1.9 |
Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.1
Interest cost | (0.2) | 0.2 | 0.3 | 0.5
Expected return on plan assets | 0.0 | 0.0 | 0.0 | 0.0
Amortization of prior service cost (benefit) | 0.2 | (0.3) | (0.3) | (0.8)
Amortization of net loss (benefit) | 0.2 | 0.0 | (0.2) | 0.0
Curtailment and Settlement loss from discontinued operations |  |  | 0.0 | 0.0
Net periodic cost | $ 0.2 | $ (0.1) | (0.2) | $ (0.2)
Postretirement | Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic cost |  |  | $ 0.2 |

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