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Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash | $ 106,000,000 | $ 86,600,000 |
Lease term on real estate under development (in years) | 10 years |  |
Debt agreement term | 11 years |  |
Line of credit debt issuance costs | $ 8,700,000 | 11,100,000 |
Business promotion and advertising costs | 74,400,000 | 85,100,000 | $ 68,900,000
Estimated fair value of mortgage servicing rights | 1,200,000,000 | 1,100,000,000 | 891,000,000
Mortgage servicing rights, impairment charges | $ 0 | 0 |
Ancillary Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue |  |
Revenue | $ 31,404,000,000 | 30,174,000,000 | 26,950,000,000
Prepayment fees/late fees earned from loans servicing | 5,300,000 | 22,700,000 | 41,700,000
Ancillary income earned from loans servicing | 108,400,000 | 22,600,000 | 9,800,000
Reserve for claims insurance programs | 179,900,000 | 167,900,000 |
Reserve for claims insurance programs, current | $ 3,600,000 | 3,000,000 |
Late Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue |  |
Servicing fees |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Revenue | $ 315,500,000 | $ 309,500,000 | $ 288,000,000
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% |  |
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 |  |

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