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Financial instruments - Changes in Level 3 Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	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)

X

- Definition

The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]]

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The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]]

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