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Share repurchase program Share repurchase program (Details) - $ / shares
3 Months Ended
Sep. 30, 2015
Oct. 22, 2014
Equity, Class of Treasury Stock    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   35,000,000
Shares repurchased (in shares) 2,770,624  
Treasury Stock Acquired, Average Cost Per Share $ 111.89