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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Effective tax rate (as a percent) | 66.00% | 0.00% | (1.80%)
Deferred tax asset valuation allowance, increase (decrease) | $ (7.4) | $ 12.0 |
Operating loss carryforwards | 396.2 |  |
Disallowed business interest expense carryforwards | 500.9 |  |
State net operating loss carryforwards | 1,058.0 |  |
Foreign net operating loss carryforwards | 184.7 |  |
General business tax credit | 6.2 |  |
Foreign tax credits | 0.2 |  |
State credits | 4.7 |  |
Uncertain tax positions | 41.7 |  |
Release of uncertain tax position reserves | (11.3) |  |
Interest and penalties related to an IRS audit | 4.8 |  |
Unrecognized tax benefits, accrued interest and penalties | 0.1 | $ 4.6 |
U.S Disallowed Interest Expense Carryforward |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deferred tax asset valuation allowance, increase (decrease) | 6.1 |  |
Foreign Valuation Allowances |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deferred tax asset valuation allowance, increase (decrease) | (10.9) |  |
Currency Translation Adjustment |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deferred tax asset valuation allowance, increase (decrease) | 0.6 |  |
Other |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deferred tax asset valuation allowance, increase (decrease) | (3.2) |  |
Foreign Tax Jurisdiction |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Foreign capital loss carry forwards | $ 43.2 |  |

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