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Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Results of Operations (Unaudited) (Footnote) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]    
Increase in fair value of non-agency MSRs   $ 84.4
Increase in valuation of financing liabilities   $ 73.4
Recovery of losses related to a settlement of outstanding claims $ 28.5