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Leases - Narrative (Details) $ in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Jan. 31, 2025 USD ($) ft²	Jun. 30, 2024 USD ($) ft²	Oct. 31, 2023 USD ($) ft²	Dec. 31, 2023 USD ($) ft² tranche	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) ft² tranche	Dec. 31, 2022 USD ($)	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Lease, renewal term					5 years
Operating sublease, extension term					4 years
Sublease income					$ 14.0	$ 15.3
Non-lease component					200.1
Asset impairment charges					0.1	3.6	$ 175.2
Total liability					315.3
Lease not yet commenced, amount					84.0
Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Operating lease, term of contract								15 years
Minimum obligations					170.7
Gain on partial operating lease termination				$ 158.8		158.8
Total liability					133.3
Operating lease, unrecoverable maintenance costs liability				$ 70.0	51.7	$ 70.0
Corporate Headquarters Lease | Bridge Loan | Line of Credit
Lessee, Lease, Description [Line Items]
Letter of credit					$ 17.5
Corporate Headquarters Lease Amendment
Lessee, Lease, Description [Line Items]
Area of leased property surrendered | ft²		54,000	52,000	165,000		165,000
Lease termination liability				$ 79.0		$ 79.0
Number of tranches | tranche				3		3
Lease termination payment		$ 14.9	$ 28.1
Corporate Headquarters Lease Amendment | Subsequent Event
Lessee, Lease, Description [Line Items]
Area of leased property surrendered | ft²	59,000
Lease termination payment	$ 36.0
Minimum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term					1 year
Operating sublease, term					1 year
Operating leases, not yet commenced, term of contract					6 years
Maximum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term					12 years
Operating sublease, term					9 years
Operating leases, not yet commenced, term of contract					7 years

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