Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Net income (loss)			$ 144,697,000	$ (203,597,000)	$ (385,627,000)
Revenue			(1,892,629,000)	(2,026,598,000)	(2,078,925,000)
Pre tax net income			192,524,000	(52,327,000)	(43,920,000)
Marketable securities, unrealized losses			$ 0	0	0
Revenue recognition discontinuation period (more than)	90 days		90 days
Revenue recognition resume period (less than)			60 days
Finite-lived intangible assets, estimated useful lives	10 years		10 years
Amortization expense			$ 15,000,000	16,000,000	16,000,000
United States
Property, Plant and Equipment [Line Items]
Revenue			$ (1,594,983,000)	(1,700,864,000)	$ (1,712,079,000)
Recognition period			5 years
United Kingdom
Property, Plant and Equipment [Line Items]
Recognition period			2 years
Other assets
Property, Plant and Equipment [Line Items]
Unamortized contract costs	$ 28,000,000		$ 28,000,000	$ 28,000,000
Internal-use software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years		3 years
Minimum
Property, Plant and Equipment [Line Items]
Lease period			3 years
Maximum
Property, Plant and Equipment [Line Items]
Lease period			5 years
Revision of prior period, error correction, adjustment
Property, Plant and Equipment [Line Items]
Net income (loss)		$ 4,000,000
Revenue	$ 5,000,000
Pre tax net income	$ 3,000,000