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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance $ 2,580.6 $ 2,323.3 $ 2,665.2 $ 2,250.1
Sales 0.0 0.0 0.0 (149.4)
Recognized on the sale of residential mortgage loans 31.5 60.2 62.6 106.0
Purchases 19.1 36.9 44.0 83.7
Servicing transfers and adjustments (32.5) 14.7 (32.5) 13.9
Changes in fair value recognized in earnings:        
Changes in valuation inputs or assumptions 136.8 118.3 53.2 321.8
MSR realization of expected cash flows (59.6) (67.6) (116.6) (140.4)
Total MSR fair value gains (losses) 77.2 50.7 (63.3) 181.4
Realization of expected cash flows (59.7) (67.6) (116.8) (140.4)
Ending balance 2,675.7 2,485.7 2,675.7 2,485.7
Servicing Asset at Fair Value, Period Increase (Decrease) 77.1 50.7 (63.6) 181.4
Servicing assets at fair value, net additions (sales) recognized 18.1 111.7 74.1 54.2
Derivative, Gain (Loss) on Derivative, Net 47.4 (13.3) 44.0 18.7
MSR valuation adjustments, net 48.9 (22.1) 117.9 (57.5)
Total MSR Reserve Fair Value Gains (Losses) 0.1 0.0 0.3 0.0
UPB of MSRs sold     31.3 11,100.0
ESS Financing Liability        
Changes in fair value recognized in earnings:        
Servicing Liability at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions (3.6) 0.0 (5.6) 0.0
Realization of expected cash flows (8.1) 0.0 (14.9) 0.0
Total Fair value changes in Servicing liability at fair value 4.6 0.0 9.3 0.0
ESS Financing Liability        
Changes in fair value recognized in earnings:        
Servicing Liability at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions (81.0) (40.4) (42.8) (97.2)
Realization of expected cash flows 15.6 28.8 30.1 57.0
Total Fair value changes in Servicing liability at fair value (65.4) (11.7) (12.7) (40.2)
Derivative, Gain (Loss) on Derivative, Net (65.2) (16.9) (51.1) (83.7)
MSR Asset Vehicle LLC | ESS Financing Liability        
Changes in fair value recognized in earnings:        
Realization of expected cash flows 8.4 9.5 17.0 17.9
Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 1,896.4 1,664.9 1,931.8 1,571.8
Sales 0.0 0.0 0.0 (149.3)
Recognized on the sale of residential mortgage loans 31.5 60.2 62.6 106.0
Purchases 19.1 36.9 44.0 83.7
Servicing transfers and adjustments (32.5) 11.8 (32.5) 14.7
Changes in fair value recognized in earnings:        
Changes in valuation inputs or assumptions 103.5 86.0 61.4 280.4
Realization of expected cash flows (50.6) (43.0) (99.9) (90.7)
Ending balance 1,967.4 1,816.6 1,967.4 1,816.6
Servicing Asset at Fair Value, Period Increase (Decrease) 52.9 43.0 (38.5) 189.7
Servicing assets at fair value, net additions (sales) recognized 18.1 108.8 74.1 55.1
Servicing asset at fair value, amount, derecognition (32.5)   (32.5)  
UPB of MSRs sold 2,300.0      
Fair Value Non-Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance 684.2 658.4 733.5 678.3
Sales 0.0 0.0 0.0 0.0
Recognized on the sale of residential mortgage loans 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 0.0 0.0
Servicing transfers and adjustments 0.0 2.9 0.0 (0.8)
Changes in fair value recognized in earnings:        
Changes in valuation inputs or assumptions 33.3 32.3 (8.2) 41.3
Realization of expected cash flows (9.1) (24.6) (16.9) (49.7)
Ending balance 708.4 669.1 708.4 669.1
Servicing Asset at Fair Value, Period Increase (Decrease) 24.2 7.7 (25.1) (8.4)
Servicing assets at fair value, net additions (sales) recognized $ 0.0 $ 2.9 $ 0.0 $ (0.8)