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Acquisitions - Other Business Combinations (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) acquistion	Dec. 31, 2024 USD ($) acquistion	Dec. 31, 2023 USD ($)
Fair value of consideration transferred
Number of Business Combinations | acquistion	4
Contingent consideration	$ 124,038	$ 196,898
Goodwill	$ 2,644,723	$ 2,172,873	$ 1,856,648
Asset Acquisitions
Fair value of consideration transferred
Number of Asset Acquisitions | acquistion	28	16
Asset Acquisition, Consideration Transferred	$ 227,900	$ 178,300
Asset Acquisition, Consideration Transferred, Contingent Consideration	$ 158,100
Minimum | Asset Acquisitions
Fair value of consideration transferred
Weighted-Average Life  Remaining (in years)	14 years
Maximum | Asset Acquisitions
Fair value of consideration transferred
Weighted-Average Life  Remaining (in years)	15 years
Client relationships
Fair value of consideration transferred
Weighted-Average Life  Remaining (in years)	12 years 3 months 18 days	12 years 8 months 12 days
Client relationships | Asset Acquisitions
Fair value of consideration transferred
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 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	48,500
Series of Individually Immaterial Business Acquisitions
Fair value of consideration transferred
Total consideration	75,200	113,200
Cash	58,300	64,400
Contingent consideration	15,200	48,800
Goodwill	11,600	34,300
Series of Individually Immaterial Business Acquisitions | Client relationships
Fair value of consideration transferred
Other intangibles	63,300	$ 78,900
Series of Individually Immaterial Business Acquisitions | Advisory Relationships
Fair value of consideration transferred
Other intangibles	300
Other Acquisitions
Fair value of consideration transferred
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High	$ 46,900

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