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Equity - Share repurchases (Details) - $ / shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Oct. 22, 2014
Equity, Class of Treasury Stock [Line Items]        
Shares repurchased (in shares) 818,581 4,755,273 1,738,234  
Average price per share including commissions (in USD per share) $ 179.29 $ 168.23 $ 172.59  
Maximum        
Equity, Class of Treasury Stock [Line Items]        
Number of shares authorized for repurchase       35,000,000