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Leases - Narrative (Details)	1 Months Ended			3 Months Ended		9 Months Ended
	Jan. 31, 2025 USD ($) ft²	Jun. 30, 2024 USD ($) ft²	Oct. 31, 2023 USD ($) ft²	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) ft² tranche	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Lease, renewal term				5 years		5 years
Operating sublease, extension term						4 years
Sublease income				$ 3,500,000	$ 3,600,000	$ 10,500,000	$ 11,900,000
Impairment charges				0	$ 0	0	$ 2,200,000
Leases not yet commenced				$ 76,200,000		$ 76,200,000
Leases not yet commenced, term of contract				7 years		7 years
Corporate Headquarters Lease Amendment
Lessee, Lease, Description [Line Items]
Area of leased property surrendered | ft²		54,000	52,000					165,000
Lease termination liability								$ 79,000,000
Number of tranches | tranche								3
Lease termination payment		$ 14,900,000	$ 28,100,000
Corporate Headquarters Lease Amendment | Forecast
Lessee, Lease, Description [Line Items]
Area of leased property surrendered | ft²	59,000
Lease termination payment	$ 36,000,000
Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Operating lease, term of contract									15 years
Minimum obligations				$ 175,200,000		$ 175,200,000
Corporate Headquarters Lease | Line of Credit | Letter of Credit
Lessee, Lease, Description [Line Items]
Letter of credit				$ 17,500,000		$ 17,500,000
Minimum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term				1 year		1 year
Operating sublease, term						1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term				12 years		12 years
Operating sublease, term						9 years

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