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Income taxes - Tax Credit Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	$ 230.5
2021
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	55.9
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
2024
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	22.5
2025
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	20.7
Thereafter
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	$ 66.3

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- Definition

Deferred Tax Assets Tax Credit Carry Forwards Subject To Expiration

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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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- Details

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- Details

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- Details

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- Details

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