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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Tax benefit | $ 5.8 | $ 15.9
Earnings from Continuing Operations | 1.3 | 2.5
Pension and Postretirement Benefit Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings from Continuing Operations | 1.3 | 2.5
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 | 1.0 |
Actuarial loss | 0.8 | 3.2
Tax benefit | (0.5) | (0.7)
Earnings from Continuing Operations | 1.3 | 2.5
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 | $ 1.8 | $ 3.2

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