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Quarterly Financial Data - Additional Information (Detail) - Trade Names [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Pre-tax defined benefit plan actuarial gains (losses) | $ 32.0 | $ 2.1 | $ 3.5 | $ 0.3 | $ 34.1 | $ 3.8
After-tax defined benefit plan actuarial gains (losses) | $ 24.2 | $ 1.6 | $ 2.8 | $ 0.2 |  |

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