Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Income Taxes | ||
| Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits | $ 87.6 | $ 73.6 |
| Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards | 14.0 | $ 27.0 |
| Foreign Tax Jurisdiction | ||
| Income Taxes | ||
| Loss carryforwards | 323.9 | |
| Operating loss carryforwards to expire or be refunded | 47.6 | |
| Domestic Tax Jurisdiction | ||
| Income Taxes | ||
| Loss carryforwards | 70.2 | |
| Operating loss carryforwards to expire or be refunded | 28.4 | |
| Tax credit carryforwards | 17.3 | |
| Tax credit carryforwards to expire or be refunded | 17.3 | |
| State and Local Jurisdiction | ||
| Income Taxes | ||
| Loss carryforwards | 157.0 | |
| Operating loss carryforwards to expire or be refunded | 157.0 | |
| Tax credit carryforwards | 20.0 | |
| Tax credit carryforwards to expire or be refunded | $ 12.7 | |