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Residual Commission Buyouts (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Residual Commission Buyouts [Line Items]    
Total $ 902.7  
Residual commission buyouts, net    
Residual Commission Buyouts [Line Items]    
Carrying Value 340.5 $ 337.5
Accumulated Amortization (173.2) (107.9)
Total $ 167.3 $ 229.6
Residual commission buyouts from asset acquisitions    
Residual Commission Buyouts [Line Items]    
Weighted Average Amortization Period (in years) 4 years 4 years
Carrying Value $ 326.6 $ 323.6
Accumulated Amortization (169.7) (105.7)
Total $ 156.9 $ 217.9
Residual commission buyouts from business combinations    
Residual Commission Buyouts [Line Items]    
Weighted Average Amortization Period (in years) 8 years 8 years
Carrying Value $ 13.9 $ 13.9
Accumulated Amortization (3.5) (2.2)
Total $ 10.4 $ 11.7