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Equity-based compensation - Schedule of Stock Options Valuation Assumptions (Details) - Employee Stock Option
12 Months Ended
Dec. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected volatility 25.00%
Expected dividend yield $ 0
Expected term (in years) 5 years 11 months 12 days
Risk-free interest rate 2.59%