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Share-based Compensation (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percent of annual incentive compensation receivable in shares | 100.00%
2019 Challenge Performance Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award performance period | 3 years
Award vesting rights | 100.00%
Expiration period | 10 years
2018 PSUs | PSUs |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award performance period | 2 years
2018 PSUs | PSUs | April 1, 2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting rights | 50.00%
2018 PSUs | PSUs | October 1, 2020 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting rights | 50.00%
2018 PSUs | PSUs | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award performance range | 50.00%
Award expected performance | 50.00%
2018 PSUs | PSUs | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award performance range | 125.00%
Award expected performance | 150.00%
Class A | 2019 Challenge Performance Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of ordinary share rights for each performance share | 1
Class C | 2019 Challenge Performance Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of ordinary share rights for each performance share | 1

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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