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Unsecured Convertible Senior Notes - 2023 Unsecured Convertible Senior Notes (Details) - 2023 Unsecured Convertible Senior Notes $ / shares in Units, shares in Millions | Aug. 14, 2020 USD ($) | Nov. 15, 2018 USD ($) $ / shares | Jun. 30, 2021 shares
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 210,000,000.0 |
Interest rate (as a percent) |  | 6.25% |
Conversion rate |  | 0.0520183 |
Value used in calculation of conversion rate |  | $ 1,000 |
Conversion price | $ / shares |  | $ 19.22 |
Proceeds from 2026 debt issuance used to repurchase 2023 Notes | $ 125,600,000 |  |
Principal amount of debt repurchased | $ 115,000,000.0 |  |
Number of shares outstanding on the 2023 Capped Call | shares |  |  | 4.9
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Conversion price | $ / shares |  | 19.22 |
Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Conversion price | $ / shares |  | $ 28.84 |

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