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Trade and other payables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Non-current liabilities    
Accruals $ 1.5 $ 0.0
Derivative financial instruments 0.4 0.6
Non-current trade and other payables 1.9 0.6
Current liabilities    
Trade payables 28.4 24.0
Other taxation and social security 1.3 1.3
Accruals 29.7 20.4
Interest payable 0.4 0.2
Derivative financial instruments 1.5 5.2
Current trade and other payables $ 61.3 $ 51.1