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Retirement Plans - Reconciliation of Balances of Pension Benefit Obligation and Fair Value of Plan Assets (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in pension benefit obligation:      
Benefit obligation at beginning of year $ 216,000,000.0 $ 211,900,000  
Service cost 600,000 3,300,000 $ 500,000
Interest cost $ 9,900,000 $ 10,700,000 6,800,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Compensation expense Compensation expense  
Merger of the Buck U.S. pension plan $ 95,400,000    
Net actuarial loss (gain) (10,500,000) $ 8,800,000  
Benefits paid (15,400,000) (18,700,000)  
Benefit obligation at end of year 296,000,000.0 216,000,000.0 211,900,000
Change in plan assets:      
Fair value of plan assets at beginning of year 228,900,000 212,500,000  
Actual (loss) return on plan assets 15,300,000 35,100,000  
Merger of the Buck U.S. pension plan 83,700,000    
Contributions by the Company 0 0 0
Benefits paid (15,400,000) (18,700,000)  
Fair value of plan assets at end of year 312,500,000 228,900,000 $ 212,500,000
Funded status of the plan (underfunded) 16,500,000 12,900,000  
Amounts recognized in the consolidated balance sheet consist of:      
Noncurrent assets - prepaid pension asset 16,500,000 12,900,000  
Accumulated other comprehensive income 17,700,000 37,300,000  
Net amount included in retained earnings $ 34,200,000 $ 50,200,000