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Quarterly Financial Data - Additional Information (Detail) - Tradename [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Pre-tax defined benefit plan actuarial and settlement loss | $ 2.6 | $ 0.6 |  |  | $ 3.2 |
After-tax defined benefit plan actuarial and settlement gain (loss) | $ 2.4 | $ 0.4 |  |  |  |
Pre-tax defined benefit plan actuarial gain (loss) |  |  | $ 32.0 | $ 2.1 |  | $ 34.1
After-tax defined benefit plan actuarial gain (loss) |  |  | $ 24.2 | $ 1.6 |  |

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- Definition Defined benefit plan, actuarial and settlement gain (loss) before tax. + References No definition available. + Details
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- Definition Defined Benefit Plan, Actuarial Gain (Loss) After Tax + References No definition available. + Details
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- Details
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