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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Postretirement Plans: |  |  |  |
Total reclassification for the period | $ 34.8 | $ 38.6 | $ 69.7 | $ 77.3
Postretirement Plans |  |  |  |
Postretirement Plans: |  |  |  |
Amortization of postretirement plan items, before tax | 35.8 | 39.8 | 71.7 | 79.8
Income tax benefit | (1.0) | (1.2) | (2.0) | (2.5)
Total reclassification for the period |  |  | 69.7 |
Amortization of prior service cost |  |  |  |
Postretirement Plans: |  |  |  |
Amortization of postretirement plan items, before tax | (1.5) | (1.8) | (3.0) | (3.6)
Amortization of actuarial losses |  |  |  |
Postretirement Plans: |  |  |  |
Amortization of postretirement plan items, before tax | $ 37.3 | $ 41.6 | $ 74.7 | $ 83.4

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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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