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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance   $ 2,250.1 $ 1,294.8 $ 1,486.4
Sales   (154.4) 0.0 (0.1)
Recognized on the sale of residential mortgage loans   234.7 222.7 68.7
Purchase of MSRs $ 575.3 181.6 844.1 285.1
Servicing transfers and adjustments   (25.3) (10.8) (265.8)
Servicing assets at fair value, net additions recognized   236.6 1,056.0 87.9
Changes in valuation inputs or assumptions   $ 454.0 $ 149.5 $ (108.1)
ServicingAssetAtFairValueOtherChangeInFairValueStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag   Realization of cash flows Realization of cash flows Realization of cash flows
Realization of cash flows   $ (275.5) $ (250.2) $ (171.4)
Ending balance   2,665.2 2,250.1 1,294.8
Servicing Asset at Fair Value, Period Increase (Decrease)   $ 178.5 $ (100.7) (279.5)
Financing Receivable, Percent Past Due   11.10% 10.50%  
Derivative, Gain (Loss) on Derivative, Net   $ 23.5 $ 13.3 (35.3)
MSR valuation adjustments, net   (10.4) (98.5) (135.2)
MSR realization of expected cash flows   275.2 250.2 171.4
Total MSR fair value gains (losses)   (176.5) 100.4  
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions   (451.7) (149.8) 108.1
Financing Liability Excess Servicing Spread        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Changes in fair value   (1.4) 0.0 0.0
Runoff and Settlements   6.6 0.0 0.0
Total Fair value changes in Servicing liability at fair value   8.0 0.0 0.0
ESS Financing Liability        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Changes in fair value   192.1 77.9 (3.8)
Runoff and Settlements   104.1 89.4 113.0
Total Fair value changes in Servicing liability at fair value   (88.0) 11.4 116.8
Derivative, Gain (Loss) on Derivative, Net   $ (106.9) $ (9.5) 27.5
Financial Asset, 30 to 59 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   4.80% 4.10%  
Financial Asset, 60 to 89 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   1.80% 1.60%  
Financial Asset, Equal to or Greater than 90 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   4.50% 4.80%  
Fair Value Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance   $ 1,571.8 $ 578.9 714.0
Sales   (154.4) 0.0 0.0
Recognized on the sale of residential mortgage loans   234.7 222.7 68.7
Purchase of MSRs   181.6 844.1 285.1
Servicing transfers and adjustments   (24.3) 0.1 (266.2)
Servicing assets at fair value, net additions recognized   237.6 1,067.0 87.6
Changes in valuation inputs or assumptions   307.8 62.4 (145.3)
Realization of cash flows   (185.4) (136.5) (77.4)
Ending balance   1,931.8 1,571.8 578.9
Servicing Asset at Fair Value, Period Increase (Decrease)   $ 122.4 $ (74.1) (222.7)
Financing Receivable, Percent Past Due   3.30% 3.70%  
Fair Value Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   1.70% 1.40%  
Fair Value Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   0.50% 0.40%  
Fair Value Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   1.10% 1.90%  
Fair Value Non-Agency Mortgage Servicing Rights        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Beginning balance   $ 678.3 $ 715.9 772.4
Sales   0.0 0.0 (0.1)
Recognized on the sale of residential mortgage loans   0.0 0.0 0.0
Purchase of MSRs   0.0 0.0 0.0
Servicing transfers and adjustments   (0.9) (10.9) 0.4
Servicing assets at fair value, net additions recognized   (0.9) (10.9) 0.3
Changes in valuation inputs or assumptions   146.2 87.1 37.3
Realization of cash flows   (90.1) (113.7) (94.0)
Ending balance   733.5 678.3 715.9
Servicing Asset at Fair Value, Period Increase (Decrease)   $ 56.1 $ (26.7) $ (56.8)
Financing Receivable, Percent Past Due   20.40% 18.00%  
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   8.50% 7.20%  
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   3.30% 2.80%  
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Financing Receivable, Percent Past Due   8.60% 8.00%