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Organization, Basis of Presentation and Significant Accounting Policies - Change in Presentation (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification [Line Items]                      
Servicing Asset, Fair Value, Change in Fair Value, Valuation Input, Statement of Income or Comprehensive Income [Extensible Enumeration] MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net MSR valuation adjustments, net  
Total other income (expense), net                 $ (386,200,000) $ (346,700,000) $ (355,700,000)
MSR valuation adjustments, net                 10,400,000 98,500,000 135,200,000
Income (loss) before income taxes                 24,900,000 (4,400,000) (105,700,000)
Net cash provided by (used in) operating activities                 173,200,000 (468,400,000) 261,000,000.0
Investment in equity method investee, net                 (19,000,000.0) (23,300,000) 0
Distribution of earnings from equity method investee                 18,500,000 3,600,000 0
Net increase (decrease) in cash, cash equivalents and restricted cash                 $ 10,700,000 (93,700,000) (135,100,000)
Previously Reported                      
Reclassification [Line Items]                      
Investment in equity method investee, net   $ (14,000,000.0) $ (12,000,000.0) $ (12,000,000.0) $ (3,600,000)            
Previously Reported | Loss (gain) on valuation of Pledged MSR financing liability                      
Reclassification [Line Items]                      
Loss (gain) on valuation of Pledged MSR financing liability $ (3,700,000) (89,600,000) (39,900,000) (55,500,000) (6,700,000) $ (61,300,000) $ (8,400,000) $ (1,600,000)   (77,900,000) 17,900,000
Previously Reported | Other Income (Expense)                      
Reclassification [Line Items]                      
Total other income (expense), net (28,000,000.0) 67,800,000 11,700,000 28,500,000 22,400,000 (39,500,000) 12,500,000 16,100,000   11,400,000 116,800,000
Restatement Adjustment                      
Reclassification [Line Items]                      
MSR valuation adjustments, net                   5,600,000  
Net increase (decrease) in cash, cash equivalents and restricted cash   0 0 0              
Revision of Prior Period, Reclassification, Adjustment                      
Reclassification [Line Items]                      
MSR valuation adjustments, net (28,000,000.0) 67,800,000 11,700,000 28,500,000 22,400,000 (39,500,000) 12,500,000 16,100,000   11,400,000 116,800,000
Distribution of earnings from equity method investee   14,000,000.0 12,000,000.0 12,000,000.0 3,600,000            
Revision of Prior Period, Reclassification, Adjustment | MSR valuation adjustments, net                      
Reclassification [Line Items]                      
MSR valuation adjustments, net $ 3,700,000 $ 89,600,000 $ 39,900,000 $ 55,500,000 $ 6,700,000 $ 61,300,000 $ 8,400,000 $ 1,600,000   $ 77,900,000 $ (17,900,000)