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Fair Value - Summary of Reconciliation of the Changes in Fair Value of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Footnote) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gain (loss) attributable to derivatives $ 0.3 $ (1.0)  
Losses attributable to MSRs held $ (78.3) (90.3)  
NRZ [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Reimbursement to HLSS for loss of servicing revenues   $ 2.2 $ 2.0