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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Postretirement Plans: |  |  |  |
Total reclassification for the period | $ 35.2 | $ 38.5 | $ 104.9 | $ 115.8
Postretirement Plans |  |  |  |
Postretirement Plans: |  |  |  |
Amortization of postretirement plan items, before tax | 36.2 | 39.8 | 107.9 | 119.6
Income tax benefit | (1.0) | (1.3) | (3.0) | (3.8)
Total reclassification for the period |  |  | 104.9 |
Amortization of prior service cost |  |  |  |
Postretirement Plans: |  |  |  |
Amortization of postretirement plan items, before tax | (1.4) | (1.7) | (4.4) | (5.3)
Amortization of actuarial losses |  |  |  |
Postretirement Plans: |  |  |  |
Amortization of postretirement plan items, before tax | $ 37.6 | $ 41.5 | $ 112.3 | $ 124.9

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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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