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Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
U.S. Federal | $ 370.7 |
State and local | 203.4 |
Foreign | 266.3 |
Total tax loss carryforwards | 840.4 | $ 795.2
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, not set to expire | 272.5 |
Total tax loss carryforwards | 840.4 | $ 795.2
2022 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.8 |
2023 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.0 |
2024 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.0 |
2025 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 15.5 |
2026 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 10.3 |
Thereafter |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | $ 502.3 |

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