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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Additional interest expense | $ 27.4 | $ 29.8
Tax benefit | 15.9 | 0.1
Pension and Postretirement Benefit Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings from Continuing Operations | 2.5 | 2.5
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Tax benefit | (0.7) | (0.8)
Earnings from Continuing Operations | 2.5 | 2.5
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Other Nonoperating (Income) and Expenses, Net |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Actuarial loss | $ 3.2 | $ 3.3

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