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Consolidated Investment Products - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
CIPs
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
CIPs
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
CIPs
Consolidated Investment Products [Abstract]          
Number of consolidated investment products | CIPs 58   58   60
Number of CLOs 3   3   0
Schedule Of Consolidated Investment Products [Line Items]          
CIPs' unfunded commitments $ 4.8   $ 4.8   $ 4.7
Transfers into Level 3 - assets 0.0 $ 0.0 0.0 $ 0.0  
Debt, unpaid principal balance 697.2   $ 697.2   $ 696.9
Nonredeemable Real Estate and Private Equity Funds [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Liquidation weighted-average period     7 months 6 days   1 year 3 months 18 days
CIPs [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
CIPs' unfunded commitments 94.0   $ 94.0   $ 168.7
Unfunded commitments Company contractually obligated to fund 11.3   11.3   20.6
Transfers into Level 3 - assets 0.0 0.0 (2.2) (0.1)  
Transfers out of Level 3 - assets (0.1) $ 0.0 (1.1) $ (29.0)  
Debt, unpaid principal balance $ 685.6   $ 685.6   $ 50.8
CIPs [Member] | Nonredeemable Real Estate and Private Equity Funds [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Liquidation weighted-average period     4 years 8 months 12 days   4 years 4 months 24 days
CIPs [Member] | Minimum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 1.00%   1.00%   2.08%
CIPs [Member] | Maximum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 6.31%   6.31%   7.94%
Collateralized loan obligations [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Net losses related to its own economic interests $ (2.1)   $ (2.3)    
Debt, unpaid principal balance 613.3   613.3    
Collateralized loan obligations [Member] | CIPs [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Debt, unpaid principal balance $ 537.3   $ 537.3   $ 0.0
Collateralized loan obligations [Member] | CIPs [Member] | Minimum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 3.01%   3.01%    
Collateralized loan obligations [Member] | CIPs [Member] | Maximum [Member]          
Schedule Of Consolidated Investment Products [Line Items]          
Stated interest rate 8.72%   8.72%