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Other long-term liabilities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract] |  |
Undiscounted amount of estimated cash flows required to settle liabilities | $ 35.5 | $ 38.1

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- Definition Undiscounted Estimated Cash Flows Required To Settle Liabilities + References No definition available. + Details
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