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Income Taxes - Returns Currently Under Examination (Details)
item in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
item
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Deferred tax liability attributable to noncontrolling interest, net $ 320.5        
Returns currently under examination | item     0.0    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 21.00% 35.00%
Amount of income tax benefit from change in stat statutory tax rate $ 8.5        
Amount of income tax benefit from effect of Tax Cuts and Jobs Act of 2017   $ 13.7      
Private National Mortgage Acceptance Company, LLC          
Reduction in payable to exchanged Private National Mortgage Acceptance Company, LLC   $ 32.0     $ 32.0
CA          
Adjusted state statutory rate (as a percent) 8.84%        
Previous state statutory rate (as a percent) 10.84%