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Share-based compensation - Other Plans (Details) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2017 € / shares $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares
Weighted average exercise price |  |
Outstanding at beginning of year (in euros/dollars per share) | € / shares | € 5.13 |
Expired (in euros/dollars per share) | € / shares | 3.07 |
Outstanding at end of year (in euros/dollars per share) | € / shares | € 8.52 |
Other plans |  |
Other disclosures |  |
Total weighted average grant date fair value of options issued during the period (in $ million) | $ |  | $ 1.2
Other plans | Share options |  |
Options |  |
Outstanding at beginning of year (in shares) |  | 187,500
Granted (in shares) |  | 300,000
Expired (in shares) |  | (62,500)
Outstanding at end of year (in shares) |  | 425,000
Fully vested and exercisable at end of year (in shares) | 39,062 | 39,062
Outstanding and expected to vest at end of year (in shares) | 385,938 | 385,938
Weighted average exercise price |  |
Outstanding at beginning of year (in euros/dollars per share) | $ / shares |  | $ 17.93
Granted (in dollars per share) | $ / shares |  | 6.90
Expired (in euros/dollars per share) | $ / shares |  | 27.82
Outstanding at end of year (in euros/dollars per share) | $ / shares |  | 8.69
Fully vested and exercisable at end of year (in dollars per share) | $ / shares | € 12.98 | 12.98
Outstanding and expected to vest at end of year (in dollars per share) | $ / shares |  | $ 8.25
Other plans | Restricted share units ("RSUs") | Officers |  |
Other disclosures |  |
Granted (in shares) |  | 175,000
Total weighted average grant date fair value of RSUs granted during the period (in $ million) | $ |  | $ 1.0

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and expected to vest under the stock option plan. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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