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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (163.3) | $ (175.9)
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current benefit payment liability | (1.5) | (1.1)
Accrued benefit liability | (162.1) | (174.7)
Net amount recognized | (163.6) | (175.8)
Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current benefit payment liability | (0.2) | (0.2)
Accrued benefit liability | (1.2) | (1.4)
Net amount recognized | $ (1.4) | $ (1.6)

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