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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income (expense), net | $ 3.0 | $ 2.3 | $ (8.6) | $ 3.7
Total reclassification for the period | 46.1 | 36.1 | 119.0 | 108.4
Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total reclassification for the period |  |  | 0.6 |
Amortization of prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of postretirement plan items, before tax | (1.3) | (1.4) | (4.1) | (4.2)
Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of postretirement plan items, before tax | 43.1 | 38.6 | 131.3 | 116.6
Curtailment gain |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of postretirement plan items, before tax | 0.0 | 0.0 | (5.2) | 0.0
Postretirement Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of postretirement plan items, before tax | 47.5 | 37.2 | 122.6 | 112.4
Income tax benefit | (1.4) | (1.1) | (3.6) | (4.0)
Total reclassification for the period |  |  | 118.4 |
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other income (expense), net | $ 5.7 | $ 0.0 | $ 0.6 | $ 0.0

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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