Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Restricted cash		$ 100.2
Non-marketable equity and other investments		8.6		$ 8.6
Impairment of non-marketable equity securities and other related assets	$ 7.0		$ 5.5	22.1	$ 5.3
Impairment or adjustments of non-marketable securities		0.0
Contract asset		$ 4.3		4.9
Number of operating segments | segment		1
Impairment of goodwill		$ 0.0
Deferred revenue		27.8		22.9
Deferred revenue long term		5.3		$ 5.0
Deferred revenue recognized		$ 7.1	$ 6.4
Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Useful life (years)		2 years
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Remaining performance obligation, expected recognition period		1 year
Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Useful life (years)		12 years
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Remaining performance obligation, expected recognition period		2 years