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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Tax effect | $ 109.9 | $ 79.2 | $ 237.4 | $ 189.4
Earnings from Continuing Operations | 1.1 | 4.9 | 3.1 | 7.9
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 1.1 | 4.9 | 3.1 | 7.9
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Settlement charge | 0.0 | 4.5 | 0.0 | 4.5
Prior service cost | 1.4 | 1.1 | 4.2 | 3.2
Actuarial loss | (0.1) | 0.9 | 0.0 | 2.8
Tax effect | (0.4) | (1.6) | (1.1) | (2.6)
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 | $ 1.5 | $ 6.5 | $ 4.2 | $ 10.5

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