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Financial risk management and financial instruments - Capital Allocation (Details)
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Capital allocation      
Targeted gearing ratio, temporary maximum until 2021 60.00%    
Gearing ratio 56.30% 42.20% 26.40%
Minimum      
Capital allocation      
Targeted gearing ratio 20.00%    
Maximum      
Capital allocation      
Targeted gearing ratio 40.00%