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Share based compensation reserve - Valuation Assumptions (Details) - Restricted shares
9 Months Ended
Sep. 30, 2019
$ / shares
January 1, 2016  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Revised grant date price $ 16.72
Exercise price $ 0.00
Expected volatility of the share price 22.60%
Dividend yield expected 0.00%
Risk free rate 2.65%
Employee exit rate 6.00%
EBITDA Performance Target Conditions 93.00%
January 1, 2017  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Revised grant date price $ 16.72
Exercise price $ 0.00
Expected life of restricted share 2 years
Expected volatility of the share price 22.60%
Dividend yield expected 0.00%
Risk free rate 2.65%
Employee exit rate 14.00%
EBITDA Performance Target Conditions 72.00%
January 1, 2018  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Revised grant date price $ 16.72
Exercise price $ 0.00
Expected volatility of the share price 22.70%
Dividend yield expected 0.00%
Risk free rate 2.55%
Employee exit rate 14.00%
EBITDA Performance Target Conditions 35.00%
January 1, 2019  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Revised grant date price $ 20.15
Exercise price $ 0.00
Expected life of restricted share 4 years
Expected volatility of the share price 24.00%
Dividend yield expected 0.00%
Risk free rate 1.33%
Employee exit rate 14.00%
EBITDA Performance Target Conditions 35.00%
Top of range | January 1, 2016  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Expected life of restricted share 2 years
Top of range | January 1, 2018  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Expected life of restricted share 4 years
Bottom of range | January 1, 2016  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Expected life of restricted share 1 year
Bottom of range | January 1, 2018  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Expected life of restricted share 1 year 6 months