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Share Based Payments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017
Restricted Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Description of vesting requirements for share-based payment arrangement	RSUs are settled in either cash or equity, as determined by the Company's Board of Directors at the grant date and typically vest over three years, in tranches of 20%, 30%, and 50%
Performance Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Description of vesting requirements for share-based payment arrangement	Performance Share Units ("PSUs") are performance-based awards for the achievement of specified performance metrics by specified deadlines, which are settled in cash and vest over a three-year period in tranches of 20%, 30% and 50%.
Vesting Tranche One Period [member] | Restricted Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting tranche percentage sharebased arrangements	20.00%
Vesting Tranche One Period [member] | Performance Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting tranche percentage sharebased arrangements	20.00%
Vesting Tranche Two Period [member] | Restricted Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting tranche percentage sharebased arrangements	30.00%
Vesting Tranche Two Period [member] | Performance Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting tranche percentage sharebased arrangements	30.00%
Vesting Tranche Three Period [member] | Restricted Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting tranche percentage sharebased arrangements	50.00%
Vesting Tranche Three Period [member] | Performance Share Units [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting tranche percentage sharebased arrangements	50.00%

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- Definition

Vesting tranche percentage sharebased arrangements.

+ References

No definition available.

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- Definition

The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_a&doctype=Standard
-URIDate 2017-03-09

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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