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Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Additional interest expense | $ 28.1 | $ 31.2 | $ 55.6 | $ 61.0
Tax benefit | 62.3 | 61.4 | 78.1 | 61.6
Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Earnings from Continuing Operations | 2.1 | 2.4 | 4.6 | 4.9
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Prior service cost (credit) | 0.1 |  |  | (0.1)
Tax benefit | (0.8) | (0.8) | (1.5) | (1.6)
Earnings from Continuing Operations | 2.1 | 2.4 | 4.6 | 4.9
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] |  |  |  |
Actuarial loss | $ 2.8 | $ 3.2 | $ 6.1 | $ 6.6

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