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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Additional interest expense | $ 165.3 | $ 169.0 | $ 142.7
Tax effect | 292.5 | 234.8 | 153.2
Pension and Postretirement Benefit Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Earnings from Continuing Operations | (4.2) | (9.5) | (9.2)
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 | 4.6 | 0.0
Prior service cost (credit) | 5.6 | 4.0 | 0.0
Actuarial loss | 0.0 | 3.7 | 12.1
Tax effect | (1.4) | (2.8) | (2.9)
Earnings from Continuing Operations | 4.2 | 9.5 | 9.2
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 | $ 5.6 | $ 12.3 | $ 12.1

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