The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The number of share options granted in a share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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Description of forfeiture rate share options granted.

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Share based payment arrangement expected term.

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Share-based payments - Valuations of share-based payments (Details)	12 Months Ended	42 Months Ended	75 Months Ended
	Dec. 31, 2018 USD ($) Options	Dec. 31, 2018 USD ($) Options	Dec. 31, 2018 USD ($) Options
Valuations of share-based payments
Number of options/ RSUs \| Options	807,300
Minimum
Valuations of share-based payments
Forfeiture rate used in valuation models granted	11.35%
Maximum
Valuations of share-based payments
Forfeiture rate used in valuation models granted	16.00%
Employee Stock Option Plan (ESOP)
Valuations of share-based payments
Number of options/ RSUs \| Options			4,128,521
Weighted average share price	$ 28.10
Weighted average fair value per option	$ 7.14	$ 7.14	$ 7.14
Employee Stock Option Plan (ESOP) \| Minimum
Valuations of share-based payments
Dividend yield, percentage	0.00%
Volatility, percentage	28.00%
Risk-free interest rate, percentage	0.29%
Expected term, years	2 years
Employee Stock Option Plan (ESOP) \| Maximum
Valuations of share-based payments
Dividend yield, percentage	5.03%
Volatility, percentage	49.85%
Risk-free interest rate, percentage	3.85%
Expected term, years	4 years
Restricted stock units (RSU)
Valuations of share-based payments
Number of options/ RSUs \| Options	807,300	1,903,008
Weighted average share price	$ 15.15
Weighted average fair value per option	$ 14.47	$ 14.47	$ 14.47
Restricted stock units (RSU) \| Minimum
Valuations of share-based payments
Dividend yield, percentage	0.00%
Volatility, percentage	44.43%
Risk-free interest rate, percentage	2.89%
Expected term, years	0 years
Restricted stock units (RSU) \| Maximum
Valuations of share-based payments
Dividend yield, percentage	5.70%
Volatility, percentage	64.02%
Risk-free interest rate, percentage	4.34%
Expected term, years	2 years