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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 |  |  |  |  |

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