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Consolidated Investment Products - Schedule of Financial Instruments of CIPs not Measured at Fair Value (Details) - USD ($) $ in Millions		Mar. 31, 2025	Sep. 30, 2024
Carrying Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents		$ 2,754.0	$ 3,309.5
Financial Liability [Abstract]
Debt of CLOs1		2,671.3	2,780.3
Carrying Value [Member] | CIPs [Member]
Financial Assets [Abstract]
Cash and cash equivalents		247.2	335.1
Estimated Fair Value [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents		2,754.0	3,309.5
Estimated Fair Value [Member] | Level 2 [Member]
Financial Liability [Abstract]
Debt of CLOs1		2,234.4	2,387.0
Estimated Fair Value [Member] | CIPs [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents		247.2	335.1
Receivables		1,453.2	1,479.1
Financial Liability [Abstract]
Debt of CLOs1		2,671.3	2,780.3
CIPs [Member]
Financial Assets [Abstract]
Cash and cash equivalents		785.1	1,099.4
Receivables		165.3	217.5
Financial Liability [Abstract]
Debt of CLOs1		9,532.3	9,341.5
Collateralized loan obligations [Member] | Carrying Value [Member] | CIPs [Member]
Financial Liability [Abstract]
Debt of CLOs1	[1]	9,532.3	9,341.5
Collateralized loan obligations [Member] | Estimated Fair Value [Member] | CIPs [Member] | Level 2 [Member]
Financial Liability [Abstract]
Debt of CLOs1	[1]	9,343.8	9,167.3
Collateralized loan obligations [Member] | CIPs [Member]
Financial Liability [Abstract]
Debt of CLOs1		$ 9,532.3	$ 9,341.5
[1] Substantially all was Level 2.

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