v3.26.1
Financial Instruments and Fair Value Measurements - Gross Obligations For Securities Lending Transactions (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase $ 2,620,126 $ 1,405,639
Remaining contractual maturity for securities loaned 4,089,659 3,477,831
Overnight and Continuous    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 2,270,126 905,639
Remaining contractual maturity for securities loaned 4,089,659 3,477,831
Less than 30 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 115,000 315,000
Remaining contractual maturity for securities loaned 0 0
30 - 60 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 85,000 85,000
Remaining contractual maturity for securities loaned 0 0
61 - 90 Days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 150,000 100,000
Remaining contractual maturity for securities loaned 0 0
Greater than 90 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
Remaining contractual maturity for securities loaned 0 0
Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 525,000 500,000
Remaining contractual maturity for securities loaned 4,089,659 3,477,831
Equity securities | Overnight and Continuous    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 175,000 0
Remaining contractual maturity for securities loaned 4,089,659 3,477,831
Equity securities | Less than 30 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 115,000 315,000
Remaining contractual maturity for securities loaned 0 0
Equity securities | 30 - 60 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 85,000 85,000
Remaining contractual maturity for securities loaned 0 0
Equity securities | 61 - 90 Days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 150,000 100,000
Remaining contractual maturity for securities loaned 0 0
Equity securities | Greater than 90 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
Remaining contractual maturity for securities loaned 0 0
U.S. and Non-U.S. government obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 2,095,126 905,639
U.S. and Non-U.S. government obligations | Overnight and Continuous    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 2,095,126 905,639
U.S. and Non-U.S. government obligations | Less than 30 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
U.S. and Non-U.S. government obligations | 30 - 60 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
U.S. and Non-U.S. government obligations | 61 - 90 Days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase 0 0
U.S. and Non-U.S. government obligations | Greater than 90 days    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase $ 0 $ 0