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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability $ (79.9) $ (80.9)
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current benefit payment liability (1.5) (1.3)
Accrued benefit liability (59.6) (60.9)
Net amount recognized (61.1) (62.2)
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current benefit payment liability (1.2) (0.8)
Accrued benefit liability (7.8) (9.0)
Net amount recognized $ (9.0) $ (9.8)