Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.24.2
Share-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 11.8 $ 11.2 $ 23.7 $ 22.0
Weighted-average grant date fair value of SARs granted     $ 9.41  
Total vesting date fair value of stock units $ 10.6 $ 2.8 $ 17.1 22.8
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of awards exercised for SARs       $ 0.1
Share-Based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance stock unit awards vesting date     Mar. 31, 2025  
Share-Based Payment Arrangement, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance stock unit awards vesting date     Mar. 31, 2026  
Share-Based Payment Arrangement, Tranche Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance stock unit awards vesting date     Mar. 31, 2027  
SARs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair value of SARs granted $ 4.94 $ 6.09 $ 4.51 $ 6.71
SARs granted [1]     7,305  
SARs exercised 0 0 0  
Service Condition Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost on non-vested stock awards $ 88.1   $ 88.1  
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition     1 year 10 months 24 days  
[1] Includes 3.4 million performance condition SARs granted to a consultant