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Debt - Senior Secured Convertible Notes due 2027 (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 17, 2020 USD ($) component $ / shares shares | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2021 USD ($)
Line of Credit Facility |  |  |  |  |  |  |
Principal balance |  | $ 1,061,400,000 |  | $ 1,061,400,000 |  | $ 1,130,600,000 |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
2027 Notes | Convertible Debt |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Principal balance | $ 497,100,000 | $ 485,300,000 |  | $ 485,300,000 |  | $ 485,300,000 |
Stated interest rate (as a percent) | 6.00% |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |
Percentage of notes initially convertible to common stock | 42.00% |  |  |  |  |  | 41.00%
Repurchased face amount |  |  |  |  |  |  | $ 11,800,000
Minimum qualified cash required | $ 30,000,000.0 |  |  |  |  |  |
Number of components | component | 2 |  |  |  |  |  |
Fair value of equity component of debt |  | 279,600,000 |  | 279,600,000 |  | 279,600,000 |
Interest expense |  | 7,300,000 | $ 7,300,000 | 21,800,000 | $ 21,800,000 |  |
Interest paid |  |  |  | 14,600,000 | 14,600,000 |  |
Amortization of the discount |  | 3,800,000 | 3,400,000 | 11,000,000 | 9,900,000 |  |
Amortization of debt issuance costs |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
Effective interest rate (as a percent) |  | 10.50% |  | 10.50% |  |  |
2027 Notes | Convertible Debt | Fair Value, Inputs, Level 2 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Debt fair value |  | $ 595,300,000 |  | $ 595,300,000 |  | $ 395,600,000 |
2027 Notes | Convertible Debt | Period 1 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Redemption rate | 110.00% |  |  |  |  |  |
Maximum repurchase amount | $ 100,000,000 |  |  |  |  |  |
Repurchase period after debt maturity | 91 days |  |  |  |  |  |
Total gross leverage ratio | 1.5 |  |  |  |  |  |
2027 Notes | Convertible Debt | Period 2 |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Redemption rate | 130.00% |  |  |  |  |  |
Maximum repurchase amount | $ 99,400,000 |  |  |  |  |  |
Redemption term (in years) | 4 years |  |  |  |  |  |
2027 Notes | Convertible Debt | Scenario, Plan |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |
Initial conversion rate (in shares) | shares | 200 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 5.00 |  |  |  |  |  |

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