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Commitments and contingencies (Debt Covenant Ratios) (Details)	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Fixed Charge Coverage Ratio	1.86	1.80	1.86	1.83
Leverage Ratio	3.77	3.83	3.76	3.83

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- Definition

Debt Instrument, Covenant Compliance, Fixed Charge Coverage Ratio

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- Definition

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

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