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Residual Commission Buyouts (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Residual Commission Buyouts [Line Items]
Total	$ 3,015.5
Residual commission buyouts, net
Residual Commission Buyouts [Line Items]
Gross Carrying Value	359.4	$ 351.2
Accumulated Amortization	(251.6)	(194.0)
Total	$ 107.8	$ 157.2
Residual commission buyouts from asset acquisitions
Residual Commission Buyouts [Line Items]
Weighted Average Amortization Period (in years)	4 years	4 years
Gross Carrying Value	$ 345.5	$ 337.3
Accumulated Amortization	(246.5)	(190.1)
Total	$ 99.0	$ 147.2
Residual commission buyouts from business combinations
Residual Commission Buyouts [Line Items]
Weighted Average Amortization Period (in years)	8 years	8 years
Gross Carrying Value	$ 13.9	$ 13.9
Accumulated Amortization	(5.1)	(3.9)
Total	$ 8.8	$ 10.0

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Residual Commission Buyouts [Line Items]

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