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Consolidated Investment Products - Schedule of Valuation Techniques and Significant Unobservable Inputs used in Level 3 Fair Value Measurements (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 551.6 $ 440.0
CIPs [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 2,109.4 $ 3,467.4
Equity Securities [Member] | Minimum [Member] | Market comparable companies [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
EBITDA multiple 5 5.5
Equity Securities [Member] | Minimum [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 8.00% 5.70%
Equity Securities [Member] | Maximum [Member] | Market comparable companies [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
EBITDA multiple 13.6 12.3
Equity Securities [Member] | Maximum [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 16.50% 17.90%
Equity Securities [Member] | Weighted Average [Member] | Market comparable companies [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
EBITDA multiple 9.3 9.0
Equity Securities [Member] | Weighted Average [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 14.10% 14.30%
Equity Securities [Member] | Weighted Average [Member] | Market pricing [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Price to earnings ratio   $ 10.0
Equity Securities [Member] | CIPs [Member] | Level 3 [Member] | Market comparable companies [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 171.9 $ 101.9
Equity Securities [Member] | CIPs [Member] | Level 3 [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 27.8 44.4
Equity Securities [Member] | CIPs [Member] | Level 3 [Member] | Market pricing [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value   $ 14.4
Debt Securities [Member] | Minimum [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 7.00% 5.00%
Risk premium   0.00%
Debt Securities [Member] | Minimum [Member] | Market pricing [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Private sale pricing   $ 0.33
Debt Securities [Member] | Maximum [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 14.80% 33.00%
Risk premium   25.00%
Debt Securities [Member] | Maximum [Member] | Market pricing [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Private sale pricing   $ 0.57
Debt Securities [Member] | Weighted Average [Member] | Market comparable companies [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
EBITDA multiple 20.9  
Price to earnings ratio $ 10.0  
Debt Securities [Member] | Weighted Average [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 10.80% 9.50%
Risk premium   8.40%
Debt Securities [Member] | Weighted Average [Member] | Market pricing [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Private sale pricing $ 0.42 $ 0.52
Debt Securities [Member] | CIPs [Member] | Level 3 [Member] | Market comparable companies [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 33.9  
Debt Securities [Member] | CIPs [Member] | Level 3 [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value 78.7 $ 112.7
Debt Securities [Member] | CIPs [Member] | Level 3 [Member] | Market pricing [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 5.4 $ 22.7
Other Debt Obligations [Member] | Minimum [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 3.00%  
Other Debt Obligations [Member] | Maximum [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 22.70%  
Other Debt Obligations [Member] | Weighted Average [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Discount rate 12.00%  
Other Debt Obligations [Member] | CIPs [Member] | Level 3 [Member] | Discounted cash flow [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Investments, at fair value $ 32.3