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Bank and other loans - Additional Information (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 29, 2016 | Jun. 28, 2016
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Finance costs |  | $ 9,200,000 | $ 9,300,000 | $ 10,800,000 |  |
Bank and other loans |  | 108,800,000 | 121,000,000 | $ 131,600,000 |  |
Senior Facilities Agreement [Member] | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | $ 150,000,000 |  |  |  |  |
Senior Facilities Agreement, Accordion Feature [Member] | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | 50,000,000 |  |  |  |  |
Finance costs | $ 1,200,000 |  |  |  |  |
Loan Notes due 2018 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | 15,000,000 | 14,900,000 |  |  |
Loan Notes due 2018 | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 65,000,000 |
Bank and other loans |  | 15,000,000 | 15,000,000 |  | $ 50,000,000 |
Loan Notes due 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | 24,700,000 | 24,700,000 |  |  |
Borrowings, interest rate |  |  |  |  | 4.88% | 6.19%
Loan Notes due 2023 | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | 25,000,000 | 25,000,000 |  |  |
Loan Notes due 2026 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | 24,700,000 | 24,700,000 |  |  |
Borrowings, interest rate |  |  |  |  | 4.94% |
Loan Notes due 2026 | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | 25,000,000 | 25,000,000 |  |  |
Loan Notes due 2021 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | $ 24,900,000 | 24,900,000 |  |  |
Borrowings, interest rate |  | 3.67% |  |  |  |
Borrowings, term |  | 7 years |  |  |  |
Loan Notes due 2021 | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | $ 25,000,000 | 25,000,000 |  |  |
Revolving credit facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | 19,500,000 | 31,800,000 |  |  |
Revolving credit facility | Gross carrying amount |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bank and other loans |  | $ 21,300,000 | $ 32,800,000 |  |  |

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