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Share-Based Payments and Long-term Incentive Plan - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based payment and LTIP expense $ 14.6 $ 5.5
Accrued expenses and other payables [1] $ 237.2 $ 214.4
Weighted Average Exercise Price   $ 0.001
Number of options granted   10,000
Number of options vested 0 0
Number of options forfeited 900  
Outstanding options balance 9,100  
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated share-based compensation expense $ 9.8 $ 5.5
Retention shares or units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated share-based compensation expense 4.8  
Long-term incentive plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Accrued expenses and other payables 20.0 $ 7.6
Management equity plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated compensation expense 35.0  
Unrecognized compensation expense 0.0  
Fair value if vested at period end $ 41.3  
[1] Includes amounts due to related parties of $4.0 million for investment management fees (2023 — $2.1 million), and $1.3 million for management consulting fees (2023 — $1.2 million).