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