Quarterly report [Sections 13 or 15(d)]

Share-Based Compensation - Additional Information (Detail)

v3.25.2
Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 10.4 $ 11.8 $ 22.0 $ 23.7
Weighted-average grant date fair value of SARs granted [1]     $ 8.1  
Total vesting date fair value of stock units 5.4 $ 10.6 $ 19.8 $ 17.1
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 $ 3.88 $ 4.94 $ 4.14 $ 4.51
SARs granted [2]     2,646  
SARs exercised     0  
Stock Appreciation Rights (SARs) | Service condition [Member] | Consultants [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period beginning from the grant date     3 years  
Stock Appreciation Rights (SARs) | Service condition [Member] | Minimum [Member] | Executives [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period beginning from the grant date     2 years  
Stock Appreciation Rights (SARs) | Service condition [Member] | Maximum [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 $ 56.2   $ 56.2  
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition     1 year 7 months 6 days  
Performance Award [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period beginning from the grant date     2 years  
Performance Award [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period beginning from the grant date     3 years  
[1] Includes 1.6 million performance-based restricted stock units.
[2] Includes 0.1 million performance condition SARs.