10-K Income taxes - Narrative (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Operating Loss Carryforwards [Line Items] | ||
| Unrecognized tax benefits resulting from acquisitions | $ 1.8 | $ 13.1 |
| Unrecognized tax benefits that would impact effective tax rate | 586.0 | 419.2 |
| Accrued interest and penalties for uncertain tax positions | 25.4 | 16.1 |
| Accrued interest and penalties, uncertain tax position, noncurrent | 69.8 | 19.2 |
| Accrued interest and penalties, uncertain tax position, current | $ 4.9 | |
| Federal and State Tax Authority | ||
| Operating Loss Carryforwards [Line Items] | ||
| Tax loss carryforwards subject to expiration | 645.0 | |
| Tax loss carryforwards not subject to expiration | 681.5 | |
| Foreign tax effects | ||
| Operating Loss Carryforwards [Line Items] | ||
| Tax loss carryforwards subject to expiration | 27.2 | |
| Tax loss carryforwards not subject to expiration | $ 93.1 |