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Supplemental equity and other information - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) shares $ / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Stockholders Equity Note |  |  |
Share-based compensation cost | $ | $ 12.5 | $ 16.6 | $ 16.8
Unrecognized compensation cost related to non-vested share-based compensation | $ | $ 15.1 |  |
Unrecognized compensation recognition period | 2 years 1 month 6 days |  |
Number of stock options (in shares) | shares | 5,416 |  |
Weighted average grant date fair value (in dollars per shares) | $ / shares | $ 1.51 |  |
Weighted average exercise price (in dollars per share) | $ / shares | $ 14.45 |  |
Remaining contractual term (in years) | 3 years 7 months 6 days |  |
2027 Notes | Convertible Debt |  |  |
Stockholders Equity Note |  |  |
Aggregate shares receivable upon conversion (shares) | shares | 22,500 |  |
Securities excluded from computation of earnings per share (in shares) | shares | 14,900 |  |
2031 Notes | Convertible Debt |  |  |
Stockholders Equity Note |  |  |
Aggregate shares receivable upon conversion (shares) | shares | 143,900 |  |
Securities excluded from computation of earnings per share (in shares) | shares | 99,100 |  |
RSA |  |  |
Stockholders Equity Note |  |  |
Vesting period (years) | 3 years |  |
Aggregate intrinsic value of unvested | $ | $ 21.1 |  |
RSA | Share-Based Payment Arrangement, Tranche One |  |  |
Stockholders Equity Note |  |  |
Vesting, percentage | 33.30% |  |
RSA | Share-Based Payment Arrangement, Tranche Two |  |  |
Stockholders Equity Note |  |  |
Vesting, percentage | 33.30% |  |
RSA | Share-Based Payment Arrangement, Tranche Three |  |  |
Stockholders Equity Note |  |  |
Vesting, percentage | 33.40% |  |
RSUs |  |  |
Stockholders Equity Note |  |  |
Vesting period (years) | 3 years |  |
Performance Stock Units (PSUs) and Restricted Stock Units (RSUs) |  |  |
Stockholders Equity Note |  |  |
Aggregate intrinsic value of unvested | $ | $ 15.8 |  |
CPU's and LTCA's |  |  |
Stockholders Equity Note |  |  |
Vesting period (years) | 3 years |  |
Unrecognized compensation expense | $ | $ 14.3 |  |

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