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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
ASSETS    
Mortgage loans held for sale at fair value $ 1,631.0  
Mortgage loans held for investment 119.0  
Mortgage servicing rights 3,665.0  
LIABILITIES    
Derivative instrument, fair value (less than) 0.1 $ 0.1
Fair Value, Measurements, Recurring    
ASSETS    
Mortgage loans held for sale at fair value 1,630.8  
Mortgage loans held for investment 119.1  
Mortgage servicing rights 3,665.4  
Derivative financial instruments 49.0  
Total assets 5,464.7  
LIABILITIES    
Mortgage servicing rights financing liability 31.7  
Excess spread financing 1,184.4  
Total liabilities 1,235.8  
Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Mortgage loans held for sale at fair value 0.0  
Mortgage loans held for investment 0.0  
Mortgage servicing rights 0.0  
Derivative financial instruments 0.0  
Total assets 0.0  
LIABILITIES    
Mortgage servicing rights financing liability 0.0  
Excess spread financing 0.0  
Total liabilities 0.0  
Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Mortgage loans held for sale at fair value 1,630.8  
Mortgage loans held for investment 0.0  
Mortgage servicing rights 0.0  
Derivative financial instruments 49.0  
Total assets 1,680.2  
LIABILITIES    
Mortgage servicing rights financing liability 0.0  
Excess spread financing 0.0  
Total liabilities 19.7  
Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Mortgage loans held for sale at fair value 0.0  
Mortgage loans held for investment 119.1  
Mortgage servicing rights 3,665.4  
Derivative financial instruments 0.0  
Total assets 3,784.5  
LIABILITIES    
Mortgage servicing rights financing liability 31.7  
Excess spread financing 1,184.4  
Total liabilities 1,216.1  
IRLCs | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments 47.6  
IRLCs | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments 0.0  
IRLCs | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments 47.6  
IRLCs | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments 0.0  
Forward MBS trades | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments 0.1  
LIABILITIES    
Derivative financial instruments 19.3  
Forward MBS trades | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
Forward MBS trades | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments 0.1  
LIABILITIES    
Derivative financial instruments 19.3  
Forward MBS trades | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
LPCs | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments 1.7  
LIABILITIES    
Derivative financial instruments 0.4  
LPCs | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
LPCs | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments 1.7  
LIABILITIES    
Derivative financial instruments 0.4  
LPCs | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
Eurodollar futures | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
Eurodollar futures | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
Eurodollar futures | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments 0.0  
Eurodollar futures | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments 0.0  
LIABILITIES    
Derivative financial instruments $ 0.0  
Predecessor    
ASSETS    
Mortgage loans held for sale at fair value   1,891.0
Mortgage loans held for investment   139.0
Mortgage servicing rights   2,937.0
LIABILITIES    
Mortgage servicing rights financing liability   9.5
Predecessor | Fair Value, Measurements, Recurring    
ASSETS    
Mortgage loans held for sale at fair value   1,890.8
Mortgage loans held for investment   139.0
Mortgage servicing rights   2,937.4
Derivative financial instruments   65.0
Total assets   4,892.7
LIABILITIES    
Mortgage servicing rights financing liability   9.5
Excess spread financing   996.5
Total liabilities   1,010.8
Predecessor | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Mortgage loans held for sale at fair value   0.0
Mortgage loans held for investment   0.0
Mortgage servicing rights   0.0
Derivative financial instruments   0.0
Total assets   0.0
LIABILITIES    
Mortgage servicing rights financing liability   0.0
Excess spread financing   0.0
Total liabilities   0.0
Predecessor | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Mortgage loans held for sale at fair value   1,890.8
Mortgage loans held for investment   0.0
Mortgage servicing rights   0.0
Derivative financial instruments   65.0
Total assets   1,955.3
LIABILITIES    
Mortgage servicing rights financing liability   0.0
Excess spread financing   0.0
Total liabilities   4.8
Predecessor | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Mortgage loans held for sale at fair value   0.0
Mortgage loans held for investment   139.0
Mortgage servicing rights   2,937.4
Derivative financial instruments   0.0
Total assets   2,937.4
LIABILITIES    
Mortgage servicing rights financing liability   10.0
Excess spread financing   996.5
Total liabilities   1,006.0
Predecessor | IRLCs | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments   59.3
Predecessor | IRLCs | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments   0.0
Predecessor | IRLCs | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments   59.3
Predecessor | IRLCs | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments   0.0
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments   2.4
LIABILITIES    
Derivative financial instruments   2.8
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments   2.4
LIABILITIES    
Derivative financial instruments   2.8
Predecessor | Forward MBS trades | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | LPCs | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments   0.9
LIABILITIES    
Derivative financial instruments   0.6
Predecessor | LPCs | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | LPCs | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments   0.9
LIABILITIES    
Derivative financial instruments   0.6
Predecessor | LPCs | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Eurodollar futures | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Treasury futures | Fair Value, Measurements, Recurring    
ASSETS    
Derivative financial instruments   1.9
LIABILITIES    
Derivative financial instruments   1.4
Predecessor | Treasury futures | Fair Value, Measurements, Recurring | Level 1    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   0.0
Predecessor | Treasury futures | Fair Value, Measurements, Recurring | Level 2    
ASSETS    
Derivative financial instruments   1.9
LIABILITIES    
Derivative financial instruments   1.4
Predecessor | Treasury futures | Fair Value, Measurements, Recurring | Level 3    
ASSETS    
Derivative financial instruments   0.0
LIABILITIES    
Derivative financial instruments   $ 0.0