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Leases - Additional Information (Details)
£ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2026
GBP (£)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Floor
Dec. 31, 2022
USD ($)
Jan. 01, 2026
GBP (£)
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost   $ 60,159 $ 56,202 $ 51,913  
Variable Lease, Cost   5,815 5,548 6,563  
Operating Lease, Payments   45,572 46,030 57,456  
Operating Lease, Incentive Payments Received   2,666 $ 5,599 3,412  
Lessee, operating lease, option, number to take on additional floors | Floor     3    
New Right-of-Use Assets obtained in exchange for new operating lease liabilities   104,203 $ 182,039    
Future lease payments   $ 23,555      
Minimum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract   3 years      
Maximum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract   10 years      
Forecast [Member] | London, United Kingdom          
Lessee, Lease, Description [Line Items]          
Future lease payments | £         £ 175,000
Operating Lease, Additional Cost | £ £ 12,000        
Letter of Credit [Member]          
Lessee, Lease, Description [Line Items]          
Other Assets   $ 5,886 5,757    
Office Equipment [Member]          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost   6,372 $ 5,663 $ 5,316  
Building          
Lessee, Lease, Description [Line Items]          
New Right-of-Use Assets obtained in exchange for new operating lease liabilities   $ 81,617