Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Asset Acquisition, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill

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Acquisitions - Finite-Lived Intangible Assets Acquired (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Feb. 01, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill			$ 338,406	$ 290,366	$ 290,366	$ 290,366
AllianzGI
Business Acquisition [Line Items]
Approximate Fair Value (in thousands)		$ 120,388
Goodwill		25,000
Total assets acquired		$ 145,388
Westchester
Business Acquisition [Line Items]
Approximate Fair Value (in thousands)	$ 144,400
Goodwill	23,040
Investment management agreements \| Westchester
Business Acquisition [Line Items]
Approximate Fair Value (in thousands)	$ 138,000
Weighted Average of Useful Life (in years)	10 years
Open-end and closed-end fund investment contracts \| AllianzGI
Business Acquisition [Line Items]
Weighted Average of Useful Life (in years)		13 years
Approximate Fair Value (in thousands)		$ 101,447
Retail separate account investment contracts \| AllianzGI
Business Acquisition [Line Items]
Weighted Average of Useful Life (in years)		6 years
Approximate Fair Value (in thousands)		$ 17,000
Trade names \| AllianzGI
Business Acquisition [Line Items]
Weighted Average of Useful Life (in years)		8 years
Approximate Fair Value (in thousands)		$ 1,941
Trade names \| Westchester
Business Acquisition [Line Items]
Approximate Fair Value (in thousands)	$ 6,400
Weighted Average of Useful Life (in years)	10 years