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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, 2021 USD ($)	Dec. 31, 2023 USD ($) ft² tranche	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Lease, renewal term				5 years		5 years
Operating sublease, extension term						4 years
Sublease income						$ 15.3	$ 20.1
Non-lease component				$ 228.3		228.3
Asset impairment charges						3.6	175.2	$ 31.3
Total liability				368.0		368.0
Operating lease liabilities						(65.4)	(86.4)	(102.1)
Operating lease, not yet commenced, liability				$ 14.0		$ 14.0
Operating leases, not yet commenced, term of contract				4 years 6 months		4 years 6 months
Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Operating lease, term of contract									15 years
Minimum obligations				$ 196.2		$ 196.2
Gain on partial operating lease termination				158.8	$ 13.6	158.8		$ 13.6
Total liability				149.8		149.8
Operating lease, unrecoverable maintenance costs liability				70.2		$ 70.2	$ 70.0
Operating lease liabilities				$ 18.9
Corporate Headquarters Lease Amendment
Lessee, Lease, Description [Line Items]
Area of leased property surrendered | ft²			52,000	165,000		165,000
Lease termination liability				$ 79.0		$ 79.0
Number of tranches | tranche				3		3
Lease termination payment			$ 28.1
Corporate Headquarters Lease Amendment | Forecast
Lessee, Lease, Description [Line Items]
Area of leased property surrendered | ft²	59,000	54,000
Lease termination payment	$ 36.0	$ 14.9
Line of Credit | Letter of Credit | Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Letter of credit				$ 17.5		$ 17.5
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				13 years		13 years
Operating sublease, term						10 years

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