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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other income (expense), net | $ (8.4) | $ (1.2)
Total reclassification for the period | 34.9 | 35.8
Translation Adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total reclassification for the period | (5.3) |
Amortization of prior service cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amortization of postretirement plan items, before tax | (1.4) | (1.4)
Amortization of actuarial losses |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amortization of postretirement plan items, before tax | 43.3 | 38.6
Postretirement Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amortization of postretirement plan items, before tax | 36.6 | 37.2
Income tax benefit | (1.7) | (1.4)
Total reclassification for the period | 40.2 |
Adjustment for substantial completion of liquidation of foreign subsidiary | Translation Adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other income (expense), net | $ (5.3) | $ 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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