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Trade and other receivables - Schedule of trade and other receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Non-current Assets    
Derivative financial instruments $ 0.3 $ 0.3
Non-current trade and other receivables 0.3 0.3
Current Assets    
Trade receivables 54.0 40.5
Amounts owed by joint ventures and associates 1.8 2.8
Other receivables 4.2 3.1
Prepayments and accrued income 10.5 9.4
Derivative financial instruments 2.1 1.8
Current trade and other receivables $ 72.6 $ 57.6