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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jul. 31, 2018
Assets        
Mortgage loans held for sale $ 4,267.0 $ 1,631.0    
Mortgage loans held for investment 0.0 119.0    
Mortgage servicing rights 3,339.0 3,665.0    
Liabilities        
Mortgage servicing rights financing 47.0 32.0    
Derivative instruments at fair value, less than 0.1   $ 0.1 $ 0.1
Recurring Fair Value Measurements        
Assets        
Mortgage loans held for sale 4,267.2 1,630.8    
Mortgage loans held for investment   119.1    
Mortgage servicing rights 3,338.5 3,665.4    
Derivative financial instruments 170.0 49.0    
Total assets 7,775.5 5,464.7    
Liabilities        
Mortgage servicing rights financing 46.9 31.7    
Excess spread financing 1,280.8 1,184.4    
Total liabilities 1,346.7 1,235.8    
Recurring Fair Value Measurements | IRLCs        
Assets        
Derivative financial instruments 143.9 47.6    
Liabilities        
Derivative financial instruments 0.0      
Recurring Fair Value Measurements | Forward MBS trades        
Assets        
Derivative financial instruments 7.7 0.1    
Liabilities        
Derivative financial instruments 15.9 19.3    
Recurring Fair Value Measurements | LPCs        
Assets        
Derivative financial instruments 18.2 1.7    
Liabilities        
Derivative financial instruments 3.1 0.4    
Recurring Fair Value Measurements | Eurodollar futures        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 1        
Assets        
Mortgage loans held for sale 0.0 0.0    
Mortgage loans held for investment   0.0    
Mortgage servicing rights 0.0 0.0    
Derivative financial instruments 0.0 0.0    
Total assets 0.0 0.0    
Liabilities        
Mortgage servicing rights financing 0.0 0.0    
Excess spread financing 0.0 0.0    
Total liabilities 0.0 0.0    
Recurring Fair Value Measurements | Level 1 | IRLCs        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0      
Recurring Fair Value Measurements | Level 1 | Forward MBS trades        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 1 | LPCs        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 1 | Eurodollar futures        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 2        
Assets        
Mortgage loans held for sale 4,267.2 1,630.8    
Mortgage loans held for investment   0.0    
Mortgage servicing rights 0.0 0.0    
Derivative financial instruments 170.0 49.0    
Total assets 4,437.0 1,680.2    
Liabilities        
Mortgage servicing rights financing 0.0 0.0    
Excess spread financing 0.0 0.0    
Total liabilities 19.0 19.7    
Recurring Fair Value Measurements | Level 2 | IRLCs        
Assets        
Derivative financial instruments 143.9 47.6    
Liabilities        
Derivative financial instruments 0.0      
Recurring Fair Value Measurements | Level 2 | Forward MBS trades        
Assets        
Derivative financial instruments 7.7 0.1    
Liabilities        
Derivative financial instruments 15.9 19.3    
Recurring Fair Value Measurements | Level 2 | LPCs        
Assets        
Derivative financial instruments 18.2 1.7    
Liabilities        
Derivative financial instruments 3.1 0.4    
Recurring Fair Value Measurements | Level 2 | Eurodollar futures        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 3        
Assets        
Mortgage loans held for sale 0.0 0.0    
Mortgage loans held for investment   119.1    
Mortgage servicing rights 3,338.5 3,665.4    
Derivative financial instruments 0.0 0.0    
Total assets 3,338.5 3,784.5    
Liabilities        
Mortgage servicing rights financing 46.9 31.7    
Excess spread financing 1,280.8 1,184.4    
Total liabilities 1,327.7 1,216.1    
Recurring Fair Value Measurements | Level 3 | IRLCs        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0      
Recurring Fair Value Measurements | Level 3 | Forward MBS trades        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 3 | LPCs        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments 0.0 0.0    
Recurring Fair Value Measurements | Level 3 | Eurodollar futures        
Assets        
Derivative financial instruments 0.0 0.0    
Liabilities        
Derivative financial instruments $ 0.0 $ 0.0