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Revenue
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Management fees
The Company’s management fees are a function of the fee rates charged to clients, which are typically expressed in basis points, and the levels of the Company’s assets under management. The most significant driver of increases or decreases in this average fee rate is changes in the mix of the Company’s assets under management caused by net inflows or outflows in certain asset classes or disproportionate market movements.
Performance fees
The Company’s products subject to performance fees earn these fees upon exceeding high-water mark performance thresholds or outperforming a hurdle rate. Performance fees are recorded in revenues when the contractual performance criteria have been met and when it is probable that a significant reversal of revenue recognized will not occur in future reporting periods.
Disaggregation of management fee revenue
The geographic disaggregation of management fee revenue by location of client domicile for the three and six months ended June 30, 2025 and 2024 are as follows (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Quant & Solutions
U.S.$92.9 $79.5 $178.8 $156.8 
Non-U.S.29.4 26.0 56.4 50.9 
Management fee revenue $122.3 $105.5 $235.2 $207.7