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Financial instruments - Changes in Level 3 Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in fair value measurement, liabilities [abstract] |  |
Balance at January 1 | $ 249.6 | $ 266.0
Balance at December 31 | 240.3 | 249.6
At fair value | Level 3 |  |
Reconciliation of changes in fair value measurement, liabilities [abstract] |  |
Balance at January 1 | 2.8 | 2.9
Payments made during year | (1.3) | 0.0
New deferred consideration | 0.3 | 0.0
Gains recognized in profit or loss | (0.8) | (0.1)
Balance at December 31 | 1.0 | 2.8
Total gains for the period included in profit and loss for assets held at the end at December 31 | (0.8) | (0.1)
Change in unrealized (gains) or losses for the period included in profit and loss for assets held at the end at December 31 | $ (0.8) | $ (0.1)

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- Definition The gains (losses) recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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