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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 |  |  |

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