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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | $ 482.5 | $ 649.8 |
Group annuity/insurance contracts (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 26.0 | 25.5 | $ 24.8
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 6.3 | 3.2 |
Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 113.8 | 174.8 |
Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 291.6 | 409.7 |
Multi-strategy hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 21.3 | 17.2 |
Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | $ 23.5 | $ 19.4 |

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