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Share Plans - Schedule of Share Options Activities (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Number of shares
Beginning balance (in shares)	1,182,315
Granted during the year (in shares)	510,536
Exercised during the year (in shares)	(833,360)
Accrued dividend awards (in shares)	18,776
Lapsed during the year (in shares)	(29,205)
Ending balance (in shares)	849,062	1,182,315
Options exercisable at December 31, 2018 (in shares)	320,882
Options expected to vest as of December 31, 2018 (in shares)	528,180
Weighted- average exercise price
Beginning balance (in USD per share)	$ 6.42
Granted during the year (in USD per share)	0.67
Exercised during the year (in USD per share)	7.43
Accrued dividend awards (in USD per share)	0.66
Lapsed during the year (in USD per share)	0.67
Ending balance (in USD per share)	2.10	$ 6.42
Options exercisable at December 31, 2018 (in USD per share)	4.31
Options expected to vest as of December 31, 2018 (in USD per share)	$ 0.64
Weighted- average remaining contractual life (years)	1 year 11 months	2 years 5 months
Options exercisable, weighted-average remaining contractual life	2 years 5 months
Options expected to vest, weighted-average remaining contractual life	1 year 6 months
Aggregate intrinsic value ($M)	$ 13.3	$ 11.1
Options exercisable, Aggregate intrinsic value	4.3
Options expected to vest, Aggregate intrinsic value	$ 9.0

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Number of options outstanding, including both vested and non-vested options.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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