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Share Plans - Additional Information (Details) - $ / shares shares in Thousands	1 Months Ended
	May 31, 2019	Mar. 31, 2019
Long-Term Umbrella Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during the year (in shares)		200
Granted during the year (in USD per share)		$ 17.70
Non-Executive Directors Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during the year (in shares)	4
Granted during the year (in USD per share)	$ 15.00

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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- Details

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- Details

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