Fair value measurements - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
Aug. 30, 2024 |
Aug. 07, 2020 |
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| Debt Instrument [Line Items] | ||||
| Warrant liability | $ 12.8 | $ 21.7 | ||
| Senior Unsecured Notes Due August 2028 | Senior Notes | ||||
| Debt Instrument [Line Items] | ||||
| Stated interest rate percentage | 3.875% | 3.875% | 3.875% | |
| Long-term debt, fair value | $ 408.4 | $ 389.7 | ||
| Series I Warrants | ||||
| Debt Instrument [Line Items] | ||||
| Class of warrant or right, number of securities called by warrants or rights (in shares) | 1.0 | |||
| Exercise price per share (in dollars per share) | $ 9.8802 | |||
| Series II Warrants | ||||
| Debt Instrument [Line Items] | ||||
| Class of warrant or right, number of securities called by warrants or rights (in shares) | 1.5 | |||
| Exercise price per share (in dollars per share) | $ 15.7185 |
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- Definition Warrant Liabilities, Fair Value Disclosure No definition available.
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- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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