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Stockholders’ Deficit - Co-Founder Grant (Narrative) (Details) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 tranche shares | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2021 shares | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Allocated share-based compensation expense | $ |  | $ 90.5 | $ 95.3 |  | $ 168.5 | $ 171.3
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  | 15.4 |
Vesting period |  |  |  |  | 4 years |
Awards vesting (in shares) |  |  |  |  | 0.0 |
Co-Founder Grant | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |
Number of tranches | tranche | 9 |  |  |  |  |
Trading period | 30 days |  |  |  |  |
Allocated share-based compensation expense | $ |  | 0.7 | $ 2.0 |  | $ 1.8 | $ 4.2
Remaining unamortized stock-based compensation | $ |  | $ 0.6 |  |  | $ 0.6 |
Co-Founder Grant | Restricted Stock | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |
Co-Founder Grant | Restricted Stock | Tranche One | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage vested maximum | 20.00% |  |  |  |  |
Co-Founder Grant | Chief Executive Officer | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted (in shares) | 10.3 |  |  |  |  |
Awards vesting (in shares) |  |  |  | 2.1 |  |

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