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Revenue (Tables)
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of 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