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Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
U.S. Federal | $ 348.2 |
State and local | 247.8 |
Foreign | 245.1 |
Total tax loss carryforwards | 841.1 | $ 860.0
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 841.1 |
2020 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 23.9 |
2021 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.5 |
2022 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 15.8 |
2023 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 13.3 |
2024 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 12.2 |
Thereafter |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | $ 762.4 |

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