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Share-Based Compensation - Share-Based Compensation Amounts Included in Net Income (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 5 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense $ 2.3 $ 2.1    
Less: tax benefit (0.6) (0.5)    
Share-Based Compensation amounts included in net income $ 1.7 1.6    
Awards to non-employee directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 110.53      
Total compensation expense $ 0.2 0.2    
Award to key employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 285,000     253,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 95,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 37,000      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period (26,000)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 115.55     $ 117.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 125.55      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 129.97      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expirations Weighted Average Grant Date Fair Value $ 113.44      
Total compensation expense $ 2.1 $ 1.9