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Investments - Portfolio of Asset-Backed Loans and Other Invested Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Asset-backed loans, by major industry:    
Total asset-based loans $ 395.9 $ 818.8
Less: Allowance for credit losses 60.1 7.2
Total asset-based loans, net 335.8 811.6
Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement 106.3  
Electronics [Member]    
Asset-backed loans, by major industry:    
Total asset-based loans 70.8 245.4
Apparel    
Asset-backed loans, by major industry:    
Total asset-based loans 91.8 191.6
Jewelry    
Asset-backed loans, by major industry:    
Total asset-based loans 79.8 100.1
Other    
Asset-backed loans, by major industry:    
Total asset-based loans 102.2 153.1
Home Furnishings [Member]    
Asset-backed loans, by major industry:    
Total asset-based loans 2.3 71.7
Manufacturing [Member]    
Asset-backed loans, by major industry:    
Total asset-based loans $ 49.0 $ 56.9