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Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other income (expense), net | $ (48.1) | $ (30.4)
Total reclassifications for the period | 22.1 | 34.9
Translation Adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total reclassifications for the period | (19.0) |
Postretirement Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amortization of postretirement plan items, before tax | 23.4 | 35.9
Income tax benefit | (1.3) | (1.0)
Total reclassifications for the period | 41.1 |
Amortization of prior service cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amortization of postretirement plan items, before tax | (1.5) | (1.5)
Amortization of actuarial losses |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Amortization of postretirement plan items, before tax | 43.9 | 37.4
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other income (expense), net | $ (19.0) | $ 0.0

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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 + Details
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