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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (79.7) | $ (159.5)
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current benefit payment liability | (1.4) | (1.4)
Accrued benefit liability | (67.9) | (147.2)
Net amount recognized | (69.3) | (148.6)
Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current benefit payment liability | (1.5) | (1.1)
Accrued benefit liability | (11.8) | (12.3)
Net amount recognized | $ (13.3) | $ (13.4)

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