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Related party disclosures (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Related party disclosures        
Short-term benefits $ 0.9 $ 0.8 $ 1.6 $ 1.6
Share-based payments 1.9 1.8 2.4 3.6
Total $ 2.8 $ 2.6 $ 4.0 $ 5.2