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Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
U.S. Federal | $ 366.0 |
State and local | 180.2 |
Foreign | 266.8 |
Total tax loss carryforwards | 813.0 | $ 825.5
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, not set to expire | 271.1 |
Total tax loss carryforwards | 813.0 | $ 825.5
2024 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.4 |
2025 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 20.8 |
2026 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 15.6 |
2027 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 40.8 |
2028 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 93.1 |
Thereafter |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | $ 358.2 |

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