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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | $ 677.2 | $ 599.6 |
Group annuity/insurance contracts (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 24.2 | 23.6 | $ 23.3
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 7.8 | 7.7 |
Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 245.3 | 197.7 |
Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 355.0 | 324.6 |
Multi-strategy hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | 23.2 | 22.0 |
Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension assets | $ 21.7 | $ 24.0 |

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