v3.25.4
Share-based compensation - Narrative (Details) - USD ($)
$ in Millions
5 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 23, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based compensation expense   $ 14 $ 0 $ 0  
Related Party          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based compensation expense   $ 3      
Restricted Stock Units (RSUs)          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based payment arrangement, award vesting period   2 years      
Unrecognized compensation cost, excluding options $ 4 $ 4      
Unrecognized compensation expense, amortization, weighted average period   2 years      
Granted (in shares)   118,632      
Number of common shares issued upon conversion of equity award (in shares) 1 1      
Restricted Stock Units (RSUs) | Minimum | Share-Based Payment Arrangement, Tranche One          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based payment arrangement, award vesting period   1 year      
Restricted Stock Units (RSUs) | Maximum | Share-Based Payment Arrangement, Tranche One          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based payment arrangement, award vesting period   3 years      
Performance Shares          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based payment arrangement, award vesting period   3 years      
Unrecognized compensation cost, excluding options $ 35 $ 35      
Unrecognized compensation expense, amortization, weighted average period   2 years      
Granted (in shares)   656,544      
Expected dividend yield   0.00%      
Performance Shares | 2023 Performance Shares, Earnings Per Share          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Plan modification, target weight 50.00%        
Performance Shares | 2023 Performance Shares, Return On Invested Capital          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Plan modification, target weight 50.00%        
Performance Shares | 2024 Performance Shares, Earnings Per Share          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Plan modification, target weight 50.00%        
Performance Shares | 2024 Performance Shares, Total Shareholder Return          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Plan modification, target weight 50.00%        
Employee Stock Option          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Share-based payment arrangement, award vesting period   5 years      
Unrecognized compensation cost, options $ 2 $ 2      
Unrecognized compensation expense, amortization, weighted average period   2 years      
Expected dividend yield   0.00%      
Share-based payment award, contractual term   10 years      
2025 Omnibus Incentive Plan          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Number of shares authorized (in shares)         25,500,000