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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense | $ 28.7 | $ 32.4 | $ 89.7 | $ 98.7
Tax benefit | 81.5 | 66.2 | 143.0 | 111.1
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 3.1 | 2.7 | 8.0 | 8.2
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 |  | (0.2) | (0.1) | (0.6)
Actuarial loss | 4.2 | 3.8 | 10.8 | 11.5
Tax benefit | (1.1) | (0.9) | (2.7) | (2.7)
Earnings from Continuing Operations | 3.1 | 2.7 | 8.0 | 8.2
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Other Nonoperating (Income) and Expense, Net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications out of accumulated other comprehensive loss before taxes | $ 4.2 | $ 3.6 | $ 10.7 | $ 10.9

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