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Business Combination and Equity Acquisition - Narrative (Details) £ in Millions, $ in Millions	Oct. 01, 2022 USD ($)	Mar. 14, 2022 USD ($)	Mar. 14, 2022 GBP (£)
Federated Hermes Limited
Business Acquisition [Line Items]
Ownership percentage		100.00%	100.00%
Federated Hermes Limited
Business Acquisition [Line Items]
Additional equity interests acquired		10.00%	10.00%
Federated Hermes Limited | Class B Shares
Business Acquisition [Line Items]
Conversion of stock, amount converted		$ 47.5	£ 36.4
C.W. Henderson and Associates | Subsequent Event
Business Acquisition [Line Items]
Acquisition price	$ 28.0
Maximum contingent purchase price payments	$ 17.6
Maturity of contingent purchase price payments	5 years

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