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Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
U.S. Federal | $ 378.6 |
State and local | 178.0 |
Foreign | 268.9 |
Total tax loss carryforwards | 825.5 | $ 840.4
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, not set to expire | 275.3 |
Total tax loss carryforwards | 825.5 | $ 840.4
2023 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.2 |
2024 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 12.7 |
2025 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 19.5 |
2026 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 10.7 |
2027 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 59.9 |
Thereafter |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | $ 434.2 |

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