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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, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense), net | $ (22.6) | $ (32.9) | [1]
Postretirement Plans: |  |  |
Total reclassification for the period | 38.7 | 34.9 |
Translation Adjustments |  |  |
Postretirement Plans: |  |  |
Total reclassification for the period | 0.0 |  |
Amortization of prior service cost |  |  |
Postretirement Plans: |  |  |
Amortization of postretirement plan items, before tax | (1.8) | (1.4) |
Amortization of actuarial losses |  |  |
Postretirement Plans: |  |  |
Amortization of postretirement plan items, before tax | 41.8 | 43.3 |
Postretirement Plans |  |  |
Postretirement Plans: |  |  |
Amortization of postretirement plan items, before tax | 40.0 | 36.6 |
Income tax benefit | (1.3) | (1.7) |
Total reclassification for the period | 38.7 |  |
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other income (expense), net | $ 0.0 | $ (5.3) |
[1] | *Amounts were changed to conform to the current-year presentation. See Note 3.

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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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