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Other Assets - Schedule of Asset Based Loans by Internal Risk Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]    
Asset Backed Loans And Other Invested Assets Gross $ 46.0 $ 274.6
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Asset Backed Loans And Other Invested Assets Gross   69.0
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Asset Backed Loans And Other Invested Assets Gross 1.1 32.4
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Asset Backed Loans And Other Invested Assets Gross 14.8 74.0
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Asset Backed Loans And Other Invested Assets Gross $ 30.1 $ 99.2