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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |
Increase (decrease) in deferred tax asset valuation allowance | $ 160.4 | $ 120.7
Unrecognized tax benefits that would affect effective tax rate | 250.9 |
Effective tax rate impact | 5.3 |
Remaining unrecognized tax benefits | 245.6 |
Federal |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 2,914.6 |
Federal | Research Tax Credits |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | 491.4 |
State | California |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 555.0 |
State | California | Research Tax Credits |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards | 365.7 |
State | Other States |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 1,387.5 |
Foreign | Ireland |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 208.5 |
Foreign | Other Foreign |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | $ 10.2 |

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