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Securitizations and Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Feb. 28, 2013
Variable Interest Entity [Line Items]        
Asset-based loans $ 335.8 $ 811.6    
Variable Interest Entity, Consolidated, Carrying Amount, Asset-Backed Loans Receivable, Portion Sellers Interest 317.2 292.0    
Fifth Street [Member]        
Variable Interest Entity [Line Items]        
Noncontrolling Interest in Limited Partnerships 56.9 30.0    
Business Development Company [Member]        
Variable Interest Entity [Line Items]        
Noncontrolling Interest in Limited Partnerships 75.0      
Variable Interest Entity, Primary Beneficiary | Salus Capital Partners LLC        
Variable Interest Entity [Line Items]        
Asset-based loans     $ 331.1 $ 175.5
Variable Interest Entity, Consolidated, Carrying Amount, Asset-Backed Loans Receivable 200.2 455.9    
VIE, consolidated carrying amount obligations 356.8 484.0    
Unaffiliated long-term debt of consolidated variable-interest entity | Salus Capital Partners LLC        
Variable Interest Entity [Line Items]        
VIE, consolidated carrying amount obligations 39.6 192.0    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 0.8 $ 1.0