v3.25.4
Share-based Compensation and Other Employee Incentive Plan-related Expense - Schedule ofSARs (Details) - SARs
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
£ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Class A      
Number of shares      
Outstanding (in shares)   11.4  
Granted (in shares)   2.0  
Forfeited (in shares)   (0.9)  
Exercised (in shares)   0.0  
Outstanding (in shares)   12.5 11.4
Exercisable (in shares) 8.9 8.9  
Weighted average base price      
Outstanding (in dollars per share) | $ / shares $ 10.27 $ 10.27 $ 10.97
Granted (in dollars per share) | $ / shares   6.68  
Forfeited (in dollars per share) | $ / shares   11.24  
Exercised (in dollars per share) | £ / shares $ 6.88    
Outstanding (in dollars per share) | $ / shares   10.27 $ 10.97
Exercisable (in dollars per share) | $ / shares $ 11.75 $ 11.75  
Weighted average remaining contractual term, Outstanding   5 years 10 months 24 days  
Weighted average remaining contractual term, Exercisable   4 years 9 months 18 days  
Aggregate intrinsic value, Outstanding | $ $ 3.9 $ 3.9  
Aggregate intrinsic value, Exercisable | $   $ 1.0  
Class C      
Number of shares      
Outstanding (in shares)   22.9  
Granted (in shares)   4.1  
Forfeited (in shares)   (1.7)  
Exercised (in shares)   (0.3)  
Outstanding (in shares)   25.0 22.9
Exercisable (in shares) 17.7 17.7  
Weighted average base price      
Outstanding (in dollars per share) | $ / shares $ 10.29 $ 10.29 $ 10.97
Granted (in dollars per share) | $ / shares   6.65  
Forfeited (in dollars per share) | $ / shares   11.22  
Exercised (in dollars per share) | £ / shares $ 6.42    
Outstanding (in dollars per share) | $ / shares   10.29 $ 10.97
Exercisable (in dollars per share) | $ / shares $ 11.80 $ 11.80  
Weighted average remaining contractual term, Outstanding   5 years 10 months 24 days  
Weighted average remaining contractual term, Exercisable   4 years 9 months 18 days  
Aggregate intrinsic value, Outstanding | $ $ 8.0 $ 8.0  
Aggregate intrinsic value, Exercisable | $   $ 1.8