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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, 2019 | Mar. 31, 2018
Postretirement Plans: |  |
Total reclassification for the period | $ 34.9 | $ 38.7
Postretirement Plans |  |
Postretirement Plans: |  |
Amortization of postretirement plan items, before tax | 35.9 | 40.0
Income tax benefit | (1.0) | (1.3)
Total reclassification for the period | 34.9 |
Amortization of prior service cost |  |
Postretirement Plans: |  |
Amortization of postretirement plan items, before tax | (1.5) | (1.8)
Amortization of actuarial losses |  |
Postretirement Plans: |  |
Amortization of postretirement plan items, before tax | $ 37.4 | $ 41.8

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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=114867106&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=114867106&loc=SL34724394-108580 + Details
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