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Share repurchase program (Details) - $ / shares
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Oct. 22, 2014
Equity [Abstract]      
Authorized to be repurchased (in shares)     35,000,000
Repurchased (in shares) 260,287 555,381  
Repurchased, average price (in USD per share) $ 192.10 $ 180.06