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Bank and other loans - Schedule of bank and other loans (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 29, 2016 | Dec. 31, 2015
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | $ 108.8 | $ 121.0 |  | $ 131.6
Included in current liabilities | 15.0 | 0.0 |  |
Included in non-current liabilities | 93.8 | 121.0 |  |
Loan Notes due 2018 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 15.0 | 14.9 |  |
Loan Notes due 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 24.9 | 24.9 |  |
Loan Notes due 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 24.7 | 24.7 |  |
Loan Notes due 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 24.7 | 24.7 |  |
Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 19.5 | 31.8 |  |
Gross carrying amount | Loan Notes due 2018 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 15.0 | 15.0 | $ 50.0 |
Gross carrying amount | Loan Notes due 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 25.0 | 25.0 |  |
Gross carrying amount | Loan Notes due 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 25.0 | 25.0 |  |
Gross carrying amount | Loan Notes due 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 25.0 | 25.0 |  |
Gross carrying amount | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 21.3 | 32.8 |  |
Unamortized finance costs | Loan Notes due 2018 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | 0.0 | (0.1) |  |
Unamortized finance costs | Loan Notes due 2021 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | (0.1) | (0.1) |  |
Unamortized finance costs | Loan Notes due 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | (0.3) | (0.3) |  |
Unamortized finance costs | Loan Notes due 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | (0.3) | (0.3) |  |
Unamortized finance costs | Revolving credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Bank and other loans | $ (1.8) | $ (1.0) |  |

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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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