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Related party disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Related party disclosures        
Short-term benefits $ 0.8 $ 0.8 $ 2.4 $ 2.4
Share-based payments 0.3 1.2 2.7 4.8
Total $ 1.1 $ 2.0 $ 5.1 $ 7.2