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Other long-term liabilities - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	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

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