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Other Liabilities - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Loss Contingencies [Line Items]    
Increase in uncertain tax liability $ 19.2 $ 20.2
Loan repurchase liability 180.4 180.4
Deferred Credits and Other Liabilities $ 80.0 $ 80.0
Internal Revenue Service (IRS) [Member]    
Loss Contingencies [Line Items]    
Time period in which change of uncertain tax positions are reasonably possible   12 months