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Income taxes - Tax Credit Carryforwards (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | $ 251.4
2019 |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | 11.8
2020 |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | 24.5
2021 |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | 41.9
2022 |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | 38.1
2023 |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | 27.0
Thereafter |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, set to expire | $ 108.1

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- Definition Deferred Tax Assets Tax Credit Carry Forwards Subject To Expiration + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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