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Financial Assets and Liabilities - Gross Obligations For Securities Lending Transactions (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Remaining contractual maturity for securities sold under agreements to repurchase | $ 836,433 | $ 1,795,994
Remaining contractual maturity for securities loaned | 1,640,521 | 1,329,446
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 | 436,433 | 1,395,994
Remaining contractual maturity for securities loaned | 1,640,521 | 1,329,446
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 | 140,000 | 140,000
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 | 185,000 | 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 | 75,000 | 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 | 400,000 | 400,000
Remaining contractual maturity for securities loaned | 1,640,521 | 1,329,446
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 | 1,640,521 | 1,329,446
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 | 140,000 | 140,000
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 | 185,000 | 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 | 75,000 | 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 | 436,433 | 1,395,994
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 | 436,433 | 1,395,994
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

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