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Acquisitions - Other Business Combinations (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) letters_of_credit acquistion	Dec. 31, 2024 USD ($) acquistion letters_of_credit	Dec. 31, 2023 USD ($)
Fair value of consideration transferred
Contingent consideration	$ 124,038	$ 124,038	$ 196,898
Goodwill	2,644,723	2,644,723	2,172,873	$ 1,856,648
Goodwill, Measurement Period Adjustment		$ (26,035)	$ (16,980)
Asset Acquisitions
Fair value of consideration transferred
Number of Asset Acquisitions | acquistion		28	16
Asset Acquisition, Consideration Transferred		$ 227,900	$ 178,300
Asset Acquisition, Contingent Consideration, Liability			97,200
Client relationships | Asset Acquisitions
Fair value of consideration transferred
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	222,400	222,400	129,800
Advisor Relationships | Asset Acquisitions
Fair value of consideration transferred
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	5,500	$ 5,500	$ 48,500
Series of Individually Immaterial Business Acquisitions
Fair value of consideration transferred
Number of Businesses Acquired | letters_of_credit		6	7
Total consideration		$ 75,200	$ 113,200
Cash		58,300	64,400
Contingent consideration	15,200	15,200	48,800
Goodwill	11,600	11,600	34,300
Goodwill, Measurement Period Adjustment	3,800
Increase to provisional intangible assets acquired			11,300
Series of Individually Immaterial Business Acquisitions | Client relationships
Fair value of consideration transferred
Other intangibles	$ 63,300	$ 63,300	$ 78,900

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