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Revenue (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The geographic disaggregation of management fee revenue for the three and six months ended June 30, 2024 and 2023 are as follows (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Quant & Solutions
U.S.$79.5 $69.3 $156.8 $137.3 
Non-U.S.26.0 23.5 50.9 46.1 
Management fee revenue $105.5 $92.8 $207.7 $183.4