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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax benefit | $ 104.4 | $ 62.3 | $ 110.2 | $ 78.1
Earnings from Continuing Operations | (1.7) | 2.1 |  |
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | (1.7) | 2.1 | (3.0) | 4.6
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior service credit | 1.2 | 0.1 | 2.1 |
Actuarial loss | (1.1) | 2.8 | (1.9) | 6.1
Tax benefit | (0.6) | (0.8) | (1.0) | (1.5)
Earnings from Continuing Operations |  | 2.1 | (3.0) | 4.6
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Other Nonoperating Income, Net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications out of accumulated other comprehensive loss before taxes | $ 2.3 | $ 2.9 | $ 4.0 | $ 6.1

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