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Deferred income taxes - Reconciliation of changes in deferred tax liability (asset) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset), beginning balance | $ 11.7 | $ 12.1 |
Credited/(charged) to consolidated income statement | 4.8 | (2.3) |
Credited to other comprehensive income | (5.8) | 4.3 |
Credited to equity | 0.6 |  | $ (0.3)
Exchange difference | 1.3 | (2.4) |
Deferred tax liability (asset), ending balance | 12.6 | 11.7 | 12.1
Accelerated tax depreciation |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset), beginning balance | (10.9) | (11.0) |
Credited/(charged) to consolidated income statement | 5.2 | 0.1 |
Credited to other comprehensive income | 0.0 | 0.0 |
Credited to equity | 0.0 |  |
Exchange difference | 0.0 | 0.0 |
Deferred tax liability (asset), ending balance | (5.7) | (10.9) | (11.0)
Other temporary differences |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset), beginning balance | 2.8 | 5.1 |
Credited/(charged) to consolidated income statement | (1.0) | (2.1) |
Credited to other comprehensive income | (0.6) | 0.0 |
Credited to equity | 0.6 |  |
Exchange difference | 0.2 | (0.2) |
Deferred tax liability (asset), ending balance | 2.0 | 2.8 | 5.1
Tax losses |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset), beginning balance | 5.1 | 4.7 |
Credited/(charged) to consolidated income statement | 0.0 | 0.9 |
Credited to other comprehensive income | 0.0 | 0.0 |
Credited to equity | 0.0 |  |
Exchange difference | 0.3 | (0.5) |
Deferred tax liability (asset), ending balance | 5.4 | 5.1 | 4.7
Retirement benefit obligations |  |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |  |
Deferred tax liability (asset), beginning balance | 14.7 | 13.3 |
Credited/(charged) to consolidated income statement | 0.6 | (1.2) |
Credited to other comprehensive income | (5.2) | 4.3 |
Credited to equity | 0.0 |  |
Exchange difference | 0.8 | (1.7) |
Deferred tax liability (asset), ending balance | $ 10.9 | $ 14.7 | $ 13.3

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_90&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81&doctype=Standard -URIDate 2017-03-09 + Details
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