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Private Education Loan Term Securitizations Private Education Loan Term Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 30, 2015
Dec. 31, 2015
Jun. 30, 2015
Oct. 27, 2015
Apr. 23, 2015
Private Education Loans          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Loans sold to third parties $ 630.8     $ 701.0 $ 738.0
Pre-tax gain on sale of loans   $ 58.0 $ 77.0    
Percentage premium of private education loan term   7.80% 10.40%    
Private education loan term accounted for as a secured financing 714.0        
Private education loans encumbered   $ 687.3      
Gross profit raised from loans sold to third parties $ 623.0        
Class A and B Notes          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Ownership interest percentage on asset-backed financing 5.00%        
Class C Notes          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Ownership interest percentage on asset-backed financing 100.00%        
Residual Certificates          
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]          
Ownership interest percentage on asset-backed financing 100.00%