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Share-based compensation (Details) shares in Millions | 6 Months Ended
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Jun. 30, 2019 shares
Stock Options |
Stock issued or granted during period [Abstract] |
Stock options granted (in shares) | 0.3
Award vesting period | 3 years
Restricted Stock Units |
Stock issued or granted during period [Abstract] |
Restricted stock units granted (in shares) | 0.5
Award vesting period | 3 years
Tranche One | Stock Options |
Stock issued or granted during period [Abstract] |
Award vesting rights, percentage | 33.33%
Tranche One | Restricted Stock Units |
Stock issued or granted during period [Abstract] |
Award vesting rights, percentage | 33.33%
Tranche Two | Stock Options |
Stock issued or granted during period [Abstract] |
Award vesting rights, percentage | 33.33%
Tranche Two | Restricted Stock Units |
Stock issued or granted during period [Abstract] |
Award vesting rights, percentage | 33.33%
Tranche Three | Stock Options |
Stock issued or granted during period [Abstract] |
Award vesting rights, percentage | 33.33%
Tranche Three | Restricted Stock Units |
Stock issued or granted during period [Abstract] |
Award vesting rights, percentage | 33.33%

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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