Financial Instruments and Fair Value Measurements - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Securities borrowed
Gross Amounts of Recognized Assets	$ 3,774,108	$ 3,191,138
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	3,774,108	3,191,138
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(3,714,317)	(3,083,612)
Counterparty Netting/ Cash Collateral	(24,243)	(53,461)
Net Amount	35,548	54,065
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	1,857,034	988,929
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	1,857,034	988,929
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(1,855,760)	(988,274)
Counterparty Netting/ Cash Collateral	0	0
Net Amount	1,274	655
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Net Amount	35,548	54,065
Total
Gross Amounts of Recognized Assets	6,089,430	4,489,382
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	(435,831)	(204,775)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	5,653,599	4,284,607
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(5,570,077)	(4,071,886)
Counterparty Netting/ Cash Collateral	(39,332)	(150,169)
Net Amount	44,190	62,552
Currency forwards
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Net Amount	3,098	7,081
Trading assets, at fair value:
Gross Amounts of Recognized Assets	438,929	211,856
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	(435,831)	(204,775)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	3,098	7,081
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	0	0
Net Amount	3,098	7,081
Options
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Net Amount	4,270	751
Trading assets, at fair value:
Gross Amounts of Recognized Assets	19,359	97,459
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	19,359	97,459
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	(15,089)	(96,708)
Net Amount	$ 4,270	$ 751

Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Excludes derivative not subject to master netting arrangement or similar agreement.

Name:	us-gaap_DerivativeAssetFairValueAfterOffsetAndDeductionSubjectToMasterNettingArrangement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.