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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Debentures (Details)	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Interest rate	6.65%	6.65%
Debentures | Minimum
Disclosure of detailed information about borrowings [line items]
Interest rate		5.00%
Debentures | Maximum
Disclosure of detailed information about borrowings [line items]
Interest rate		7.30%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 7
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-URIDate 2017-03-09

+ Details

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X

- 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.

+ Details

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