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Other Assets - Schedule of Asset-based loans by Industry (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Loans and Leases Receivable Disclosure [Line Items]    
Asset Backed Loans And Other Invested Assets Gross $ 46.0 $ 274.6
Allowance For Credit Losses 11.0 47.9
Asset Backed Loans And Other Invested Assets 35.0 226.7
Apparel [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Asset Backed Loans And Other Invested Assets Gross 18.8 66.0
Manufacturing [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Asset Backed Loans And Other Invested Assets Gross 10.9 32.7
Jewelry [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Asset Backed Loans And Other Invested Assets Gross 7.2 36.9
Electronics [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Asset Backed Loans And Other Invested Assets Gross 3.1 45.9
Other    
Loans and Leases Receivable Disclosure [Line Items]    
Asset Backed Loans And Other Invested Assets Gross $ 6.0 $ 93.1