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Investments - Credit Quality Indicators (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Recorded Investment [Line Items]      
Total asset-based loans $ 818.8 $ 565.6 $ 565.6
Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total asset-based loans 195.3 306.9  
Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total asset-based loans 372.7 36.7  
Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total asset-based loans 250.8 222.0  
Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total asset-based loans