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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other income (expense), net | $ (18.0) | $ (24.5) | [1] | $ (40.6) | $ (57.4) | [1]
Postretirement Plans: |  |  |  |  |  |
Total reclassification for the period | 38.6 | 38.0 |  | 77.3 | 72.9 |
Translation Adjustments |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Total reclassification for the period |  |  |  | 0.0 |  |
Postretirement Plans |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | 39.8 | 38.5 |  | 79.8 | 75.1 |
Income tax benefit | (1.2) | (0.5) |  | (2.5) | (2.2) |
Total reclassification for the period |  |  |  | 77.3 |  |
Amortization of prior service cost |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | (1.8) | (1.4) |  | (3.6) | (2.8) |
Amortization of actuarial losses |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | 41.6 | 44.9 |  | 83.4 | 88.2 |
Curtailment gain |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |
Amortization of postretirement plan items, before tax | 0.0 | (5.2) |  | 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 | $ 0.2 |  | $ 0.0 | $ (5.1) |
[1] | Amounts were changed to conform to the current-year presentation. See Note 3.

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