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Income taxes - Tax Rates (Details)

v3.5.0.2
Income taxes - Tax Rates (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Her Majesty's Revenue and Customs (HMRC)        
Income taxes        
Tax rate (as a percent) 20.00% 20.75% 22.50% 23.75%
Internal Revenue Service (IRS)        
Income taxes        
Tax rate (as a percent) 34.00% 34.00% 34.00% 34.00%