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Financial Instruments and Risk Management - Credit and Liquidity Risk (Details) - USD ($) | Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2016
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Disclosure of continuing involvement in derecognised financial assets [line items] |  |  |
Percent of gross accounts receivable over 90 days past due (less than) | 1.00% |  |
Allowance for doubtful accounts | $ 4,300,000 |  | $ 3,100,000
Factoring of receivables from facility program |  |  |
Disclosure of continuing involvement in derecognised financial assets [line items] |  |  |
Agreement to sell trade receivables, maximum capacity | $ 200,000,000 | $ 250,000,000.0 |

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- Definition Financing Receivable, Percent Past Due2 + References No definition available. + Details
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- Definition Transfer Of Financial Assets Accounted For As Sales, Maximum Limit + References No definition available. + Details
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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Details
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