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Share-based Compensation (Details) shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 $ / shares shares | Jun. 30, 2018 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement to be paid in Cash, Liability Award, Grants in period, Weighted Average Grant Date Fair Value | $ / shares | $ 6.58 | $ 6.58
Cash-based restricted share unit awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted | shares | 4.7 |
Restricted Share Awards and Share Unit Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting rate |  | 20.00%

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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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