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Significant Accounting Policies - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 28, 2020
Mar. 15, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Sep. 26, 2014
Mar. 14, 2013
Summary Of Significant Accounting Policies [Line Items]                
Cash and cash equivalents, not available for general corporate use     $ 102,900,000 $ 70,500,000        
Restricted cash     143,059,000 121,964,000        
Client deposit held     8,100,000,000 6,100,000,000        
Right-of-use assets     $ 1,138,157,000 1,092,107,000        
Debt agreement term     10 years          
Financing costs     $ 13,000,000.0 17,000,000.0        
Write-off of financing costs on extinguished debt     75,592,000 2,608,000 $ 27,982,000      
Business promotion and advertising costs     57,200,000 76,100,000 74,800,000      
Estimated fair value of mortgage servicing rights     650,600,000 579,800,000        
Mortgage servicing rights, impairment charges     0 0        
Servicing fees from loans serviced for others     23,170,119,000 23,274,086,000 20,778,100,000      
Prepayment fees/late fees/ancillary income earned from loans servicing     11,000,000.0 14,900,000 15,900,000      
Reserve for claims insurance programs     140,500,000 125,800,000        
Reserve for claims insurance programs, current     2,800,000 1,800,000        
Investments held in trust - special purpose acquisition company     402,501,000 0        
Non- controlling interests                
Summary Of Significant Accounting Policies [Line Items]                
Investments held in trust - special purpose acquisition company     402,500,000          
Servicing fees                
Summary Of Significant Accounting Policies [Line Items]                
Servicing fees from loans serviced for others     $ 212,900,000 $ 191,800,000 167,500,000      
Wholly Owned Property                
Summary Of Significant Accounting Policies [Line Items]                
Ownership interest in property     100.00%          
Commercial Real Estate                
Summary Of Significant Accounting Policies [Line Items]                
Ownership interest in property     0.00%          
5.25% Senior Notes                
Summary Of Significant Accounting Policies [Line Items]                
Interest rate       5.25%        
5.25% Senior Notes | Senior Notes                
Summary Of Significant Accounting Policies [Line Items]                
Aggregate debt redeemed $ 425,000,000.0   $ 425,000,000.0          
Interest rate     5.25%       5.25%  
Premium paid 73,600,000              
Write-off of financing costs on extinguished debt $ 2,000,000.0              
5.00% Senior Notes                
Summary Of Significant Accounting Policies [Line Items]                
Interest rate       5.00%        
Premium paid         20,000,000.0      
Write-off of financing costs on extinguished debt         $ 8,000,000.0      
5.00% Senior Notes | Senior Notes                
Summary Of Significant Accounting Policies [Line Items]                
Aggregate debt redeemed               $ 800,000,000.0
Interest rate               5.00%
Premium paid   $ 20,000,000.0            
Write-off of financing costs on extinguished debt   $ 8,000,000.0            
2019 Credit Agreement                
Summary Of Significant Accounting Policies [Line Items]                
Financing costs       $ 1,600,000        
Write-off of financing costs on extinguished debt       2,600,000        
2019 Credit Agreement | Term Loan Facility                
Summary Of Significant Accounting Policies [Line Items]                
Financing costs       $ 5,800,000        
Accounting Standards Update 2016-02                
Summary Of Significant Accounting Policies [Line Items]                
Lease liabilities           $ 1,200,000,000    
Right-of-use assets           $ 1,000,000,000.0    
Internal computer software                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, estimated useful life     three-year          
Minimum | Enterprise software development platforms                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, estimated useful life     three          
Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, estimated useful life     10 years          
Lessee, lease term extension period     10 years          
Maximum | Buildings and Improvements                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, estimated useful life     39 years          
Maximum | Land Improvements                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, estimated useful life     15 years          
Maximum | Enterprise software development platforms                
Summary Of Significant Accounting Policies [Line Items]                
Property, plant and equipment, estimated useful life     seven years          
Maximum | Goodwill and other intangible assets                
Summary Of Significant Accounting Policies [Line Items]                
Intangible assets, estimated useful life     20 years