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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
(Benefit) provision for income taxes | 237.60% | 66.00%
Deferred tax asset valuation allowance, increase (decrease) | $ (6.6) |
Operating loss carryforwards | 409.8 |
Disallowed business interest expense carryforwards | 518.0 |
State net operating loss carryforwards | 1,100.0 |
Foreign net operating loss carryforwards | 170.0 |
General business tax credit | 13.7 |
Foreign tax credits | 0.2 |
State credits | 4.7 |
Uncertain tax positions | 46.0 |
Unrecognized tax benefits, accrued interest and penalties | 0.0 | $ 0.0
Foreign Tax Jurisdiction |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Foreign capital loss carryforwards | 46.8 |
Foreign Valuation Allowances |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred tax asset valuation allowance, increase (decrease) | (3.6) |
Capital Loss Carryforward |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred tax asset valuation allowance, increase (decrease) | (11.6) |
U.S Disallowed Interest Expense Carryforward |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred tax asset valuation allowance, increase (decrease) | 3.7 |
Currency Translation Adjustment |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred tax asset valuation allowance, increase (decrease) | 3.9 |
Other |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Deferred tax asset valuation allowance, increase (decrease) | $ 1.0 |

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