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Commitments and contingencies - Debt Covenant Ratios (Details)	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Other Commitments [Line Items]
Leverage Ratio	7.62
Debt Covenants
Other Commitments [Line Items]
Fixed Charge Coverage Ratio	0.96	1.15	1.35	1.74
Leverage Ratio	7.71	6.31	5.37	4.15

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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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