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Summary of Significant Accounting Policies, Warehouse Receivables and Facilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Restricted Cash and Cash Equivalents $ 72.2 $ 75.6
Line of Credit Facility, Maximum Borrowing Capacity $ 1,025.0 $ 650.0