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Significant Accounting Policies - Narrative (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 10, 2021 | Dec. 28, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 18, 2021 | Sep. 26, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents, not available for general corporate use |  |  | $ 125,200,000 | $ 102,900,000 |  |  |
Restricted cash |  |  | 108,830,000 | 143,059,000 |  |  |
Client deposit held |  |  | $ 8,600,000,000 | 8,100,000,000 |  |  |
Lease terms |  |  | 10 years |  |  |  |
Debt agreement term |  |  | 10 years |  |  |  |
Line of credit debt issuance costs |  |  | $ 9,500,000 | 13,000,000 |  |  |
Write-off of financing costs on extinguished debt |  |  | 0 | 75,592,000 | $ 2,608,000 |  |
Business promotion and advertising costs |  |  | 68,900,000 | 57,200,000 | 76,100,000 |  |
Estimated fair value of mortgage servicing rights |  |  | 891,000,000 | 650,600,000 |  |  |
Mortgage servicing rights, impairment charges |  |  | 0 | 0 |  |  |
Revenue |  |  | 26,950,366,000 | 23,170,119,000 | 23,274,086,000 |  |
Prepayment fees/late fees/ancillary income earned from loans servicing |  |  | 41,700,000 | 11,000,000 | 14,900,000 |  |
Reserve for claims insurance programs |  |  | 153,400,000 | 140,500,000 |  |  |
Reserve for claims insurance programs, current |  |  | 2,200,000 | 2,800,000 |  |  |
Investments held in trust - special purpose acquisition company |  |  | $ 0 | $ 402,501,000 |  |  |
Price per share (in dollars per share) |  |  |  | $ 10.00 |  |  |
Redeemed common stock (in shares) | 22,000,000 |  | 332,875,959 | 335,561,345 |  |  |
Total consideration | $ 220,000,000 |  |  |  |  |  |
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] |  |  |  |  |  |  |
Revenue |  |  | $ 288,000,000 | $ 212,900,000 | $ 191,800,000 |  |
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% |  |  |  |
2.500% Senior Notes |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Interest rate |  |  |  | 2.50% | 2.50% |  |
2.500% Senior Notes | Senior Notes |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 500,000,000 |  |  | $ 500,000,000 |
Interest rate |  |  | 2.50% |  |  |  |
Debt issuance costs |  |  | $ 5,000,000 |  |  |  |
5.25% Senior Notes |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 5.25% | 5.25% | 5.25% |  |
5.25% Senior Notes | Senior Notes |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 300,000,000
Interest rate |  |  |  |  |  |  | 5.25%
Aggregate debt redeemed |  | $ 425,000,000 |  | $ 425,000,000 |  |  |
Write-off of financing costs on extinguished debt |  | 2,000,000 |  | 2,000,000 |  |  |
Premium paid |  | $ 73,600,000 |  | $ 73,600,000 |  |  |
2019 Credit Agreement |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
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 |  |
2019 Credit Agreement | Tranche A Term Loan Facility |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Repayments of debt |  |  | $ 300,000,000 |  |  |  |
Enterprise software development platforms |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  | 3 years |  |  |  |
Minimum | Enterprise software development platforms |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  | 10 years |  |  |  |
Maximum | Buildings and Improvements |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  | 39 years |  |  |  |
Maximum | Land Improvements |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  | 15 years |  |  |  |
Maximum | Enterprise software development platforms |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  | 7 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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