Quarterly report [Sections 13 or 15(d)]

Share-Based Compensation - Additional Information (Detail)

v3.26.1
Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 10.1 $ 10.4 $ 20.7 $ 22.0
Weighted-average grant date fair value of SARs granted [1]     $ 18.81  
Total vesting date fair value of stock units $ 29.4 5.4 $ 30.2 19.8
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of awards exercised for SARs   $ 0.0   $ 0.0
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair value of SARs granted $ 7.96 $ 3.88 $ 10.13 $ 4.14
Stock Appreciation Rights (SARs) | Service condition [Member] | Executives [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period beginning from the grant date     3 years  
Service Condition Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost on non-vested stock awards $ 46.6   $ 46.6  
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition     1 year 7 months 6 days  
Total intrinsic value of awards exercised for options and SARs $ 1.0   $ 1.7  
Performance Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period beginning from the grant date     3 years  
[1] Includes 1.3 million performance-based restricted stock units.