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Stock compensation - RSU and PSU award activity (Details) - $ / shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2019
Restricted Stock Units (RSUs) |  |  |
Shares Available For Grant |  |  |
Shares Available for Grant Beginning Balance (in shares) |  |  | 545,751
Granted (in shares) |  |  | (165,251)
Cancelled (in shares) |  |  | 55,591
Shares Available for Grant Ending Balance (in shares) |  |  | 401,040
Shares Subject to Outstanding Options, Shares |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 2,043,337
Granted (in shares) |  | 190,000,000 | 165,251
Cancelled (in shares) |  |  | (55,591)
Released (in shares) |  |  | (213,604)
Outstanding at the end of the period (in shares) |  |  | 1,974,444
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 80.35
Granted (in dollars per share) |  |  | 73.69
Cancelled (in dollars per share) |  |  | 89.46
Released (in dollars per share) |  |  | 89.38
Outstanding at the end of the period (in dollars per share) |  |  | $ 78.29
Performance Stock Units (PSUs) |  |  |
Shares Available For Grant |  |  |
Achieved (in shares) |  |  | (44,940)
Cancelled (in shares) |  |  | 9,889
Shares Subject to Outstanding Options, Shares |  |  |
Granted (in shares) | 77,243 | 446,500,000 |
Achieved (in shares) |  |  | 44,940
Cancelled (in shares) |  |  | (9,889)
Shares Subject to Outstanding Options, Weighted Average Exercise Price |  |  |
Achieved (in dollars per share) |  |  | $ 65.76
Cancelled (in dollars per share) |  |  | $ 67.32

X
- Definition Represents the number of shares other than options (or share units) achieved out of shares available during the period. + References No definition available. + Details
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- Definition Represents the number of shares other than options (or share units) achieved out of shares available for grant, during the period. + References No definition available. + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards achieved. + References No definition available. + Details
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- Definition The number of shares other than options that were cancelled out of shares available for grant during the reporting period as a result of the occurrence of a terminating event specified in contractual agreements pertaining to the other than stock option plan. + References No definition available. + Details
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- Definition Represents the number of shares other than options (or share units) granted out of shares available for grant, during the period. + References No definition available. + Details
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- Definition Represents the number of shares of employee compensation programs, other than options, released during the period. + References No definition available. + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards released. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -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 Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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