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Securitizations and Variable Interest Entities - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2013
Feb. 28, 2013
Variable Interest Entity [Line Items]        
Variable Interest Entity, Consolidated, Carrying Amount, Asset-Backed Loans Receivable, Portion Sellers Interest $ 96.3 $ 317.3    
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 29.3 197.8    
VIE, consolidated carrying amount obligations 135.2 356.8    
Unaffiliated long-term debt of consolidated variable-interest entity | Salus Capital Partners LLC        
Variable Interest Entity [Line Items]        
VIE, consolidated carrying amount obligations 38.9 39.5    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 0.8 $ 0.9