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Commitments and contingencies - Debt Covenant Ratios (Details)	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Other Commitments [Line Items]
Leverage Ratio	1.39
Debt Covenants
Other Commitments [Line Items]
Fixed Charge Coverage Ratio	1.89	1.65	1.40	0.93
Leverage Ratio	3.94	4.46	5.50	7.85

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- Definition

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Debt Instrument, Covenant Terms, Ratio of Indebtedness to Earnings Before Interest, Taxes, Depreciation and Amortization

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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.

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