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Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
U.S. Federal | $ 349.6 |
State and local | 257.5 |
Foreign | 252.9 |
Total tax loss carryforwards | 860.0 | $ 837.6
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 860.0 |
2019 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 7.7 |
2020 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 25.9 |
2021 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 14.1 |
2022 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 15.1 |
2023 |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | 14.3 |
Thereafter |  |
Operating Loss Carryforwards [Line Items] |  |
Tax loss carryforwards, set to expire | $ 782.9 |

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