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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax benefit | $ 79.2 | $ 63.6 | $ 189.4 | $ 141.7
Earnings from Continuing Operations | (4.9) |  | (7.9) |
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 4.9 | 2.2 | 7.9 | 6.8
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Settlement charge | 4.5 |  | 4.5 |
Prior service cost | 1.1 |  | 3.2 |
Actuarial loss | 0.9 | 3.0 | 2.8 | 9.1
Tax benefit | (1.6) | (0.8) | (2.6) | (2.3)
Earnings from Continuing Operations |  | 2.2 |  | 6.8
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 | $ 6.5 | $ 3.0 | $ 10.5 | $ 9.1

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