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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other income (expense), net | $ (17.7) | $ (21.1) | [1] | $ (58.3) | $ (78.5) | [1]
Postretirement Plans: |  |  |  |  |  |
Total reclassification for the period | 38.5 | 46.1 |  | 115.8 | 119.0 |
Translation Adjustments |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Total reclassification for the period |  |  |  | 0.0 |  |
Postretirement Plans |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | 39.8 | 47.5 |  | 119.6 | 122.6 |
Income tax benefit | (1.3) | (1.4) |  | (3.8) | (3.6) |
Total reclassification for the period |  |  |  | 115.8 |  |
Amortization of prior service cost |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | (1.7) | (1.3) |  | (5.3) | (4.1) |
Amortization of actuarial losses |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | 41.5 | 43.1 |  | 124.9 | 131.3 |
Curtailment gain |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | 0.0 | 0.0 |  | 0.0 | (5.2) |
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other income (expense), net | $ 0.0 | $ 5.7 |  | $ 0.0 | $ 0.6 |
[1] | Amounts were changed to conform to the current-year presentation. See Note 3.

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