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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Lessee Lease Description [Line Items]      
Operating lease costs $ 57.5 $ 58.0 $ 66.6
Cash paid for operating lease liabilities included in operating cashflows 56.9 60.7 69.3
Right-of-use assets obtained in exchange for operating lease liabilities $ 82.5 $ 26.9  
Weighted average remaining lease term 6 years 3 months 18 days 6 years 3 months 18 days  
Weighted average discount rates 5.60% 5.30%  
Real Estate Office Space [Member]      
Lessee Lease Description [Line Items]      
Total gross sublease and other rental income $ 10.1 $ 7.3 6.3
Lease Agreements [Member]      
Lessee Lease Description [Line Items]      
Operating lease expense $ 1.3 $ 1.3 $ 1.3