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Financial risk management - Swaps (Details) - Interest rate swap
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
GBP (£)
USD ($)
Dec. 31, 2019
GBP (£)
USD ($)
Jun. 30, 2019
GBP (£)
USD ($)
Financial risk management activities      
Fair value of interest rate swaps, asset £ 2,504,000    
Fair value of interest rate swaps, liability   £ 2,317,000 £ 2,298,000
Long position      
Financial risk management activities      
Principal value of loan outstanding | $ 150,000 150,000 150,000
Rate received 1 month $ LIBOR 1 month $ LIBOR 1 month $ LIBOR
Rate paid 2.032% 2.032% 2.032%