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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | $ 816.0 | $ 784.9 |
Group annuity/insurance contracts (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 25.5 | 24.8 | $ 24.2
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 10.5 | 16.0 |
Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 221.1 | 287.6 |
Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 512.1 | 410.0 |
Multi-strategy hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 22.0 | 24.6 |
Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | $ 24.8 | $ 21.9 |

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