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Credit Facilities and Long-term Debt - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about borrowings [line items] |  |  |
Uncommitted bank overdraft facilities | $ 73,500,000 | $ 70,000,000 |
Amounts outstanding under overdraft facilities | 0 | 0 |
Credit Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 187,500,000 | 227,500,000 |
Commitment fees paid | 1,300,000 | 1,400,000 | $ 1,300,000
Letters of credit outstanding | 23,200,000 | 25,800,000 |
Term Loan |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Face amount of debt instrument | 250,000,000.0 |  |
Borrowings | 187,500,000 | 212,500,000 |
Quarterly principal repayment | $ 6,250,000 |  |
Term Loan | London Interbank Offered Rate LIBOR | Bottom of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Margin for borrowings | 2.00% |  |
Term Loan | London Interbank Offered Rate LIBOR | Top of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Margin for borrowings | 3.00% |  |
Revolving Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Line of credit, maximum borrowing capacity | $ 300,000,000 |  |
Borrowings | 0 | $ 15,000,000 |
Amount of accordion feature | 150,000,000.0 |  |
Uncommitted bank overdraft facilities | $ 276,800,000 |  |
Revolving Facility | Bottom of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Margin for borrowings | 0.60% |  |
Revolving Facility | Top of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Margin for borrowings | 1.40% |  |
Revolving Facility | London Interbank Offered Rate LIBOR | Bottom of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Margin for borrowings | 1.60% |  |
Revolving Facility | London Interbank Offered Rate LIBOR | Top of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Margin for borrowings | 2.40% |  |
Bridge Loan | Revolving Facility |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Line of credit, maximum borrowing capacity | $ 25,000,000.0 |  |
Bridge Loan | Revolving Facility | Top of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Debt instrument term | 7 days |  |

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- Definition Borrowings Maturity, Term + References No definition available. + Details
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- Definition Debt Instrument, Periodic Payment, Principal1 + References No definition available. + Details
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- Definition Letters Of Credit Outstanding, Amount1 + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line Of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option + References No definition available. + Details
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- Definition Line Of Credit Facility, Maximum Borrowing Capacity1 + References No definition available. + Details
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- Definition Line of Credit Facility, Commitment Fee Amount + References No definition available. + Details
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- Definition The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The adjustment to the basis (reference rate) used for calculation of 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 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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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. + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_50_a&doctype=Standard -URIDate 2017-03-09 + Details
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