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Financial Assets and Liabilities - Gross Obligations For Securities Lending Transactions (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Remaining contractual maturity for securities sold under agreements to repurchase $ 1,276,677 $ 1,271,788
Remaining contractual maturity for securities loaned 2,973,523 2,431,878
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 826,677 821,788
Remaining contractual maturity for securities loaned 2,973,523 2,431,878
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 290,000 190,000
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 110,000 185,000
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 50,000 75,000
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 450,000 450,000
Remaining contractual maturity for securities loaned 2,973,523 2,431,878
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 0 0
Remaining contractual maturity for securities loaned 2,973,523 2,431,878
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 290,000 190,000
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 110,000 185,000
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 50,000 75,000
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 826,677 821,788
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 826,677 821,788
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