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Financial risk management and financial instruments - Derivatives Entered (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2021 USD ($) $ / bbl MMBbls $ / gal R / $ | Jun. 30, 2020 USD ($) $ / gal $ / bbl R / $ MMBbls
Crude oil put options |  |
Financial risk management and financial instruments |  |
Premium paid | $ | $ 93.8 | $ 17.4
Number of barrels hedged restructured and replaced by other category | 23.5 |
Number of barrels terminated | 13.5 |
Number of barrels sold | 10.0 |
Crude oil put options purchased |  |
Financial risk management and financial instruments |  |
Number of barrels - open positions | 10.0 | 5.5
Number of barrels - settled | (32.5) | 1.0
Annual average floor price | $ / bbl | 40.5 | 34.5
Crude oil put options sold |  |
Financial risk management and financial instruments |  |
Number of barrels - open positions | (10.0) |
Annual average floor price | $ / bbl | 43.2 |
Crude oil zero cost collar |  |
Financial risk management and financial instruments |  |
Number of barrels - open positions | 24.0 | 3.1
Number of barrels - settled | 5.1 |
Annual average floor price | $ / bbl | 60.1 | 31.8
Annual average cap price | $ / bbl | 72.0 | 39.9
Crude oil swap options |  |
Financial risk management and financial instruments |  |
Number of barrels - open positions | 18.0 |
Number of barrels - settled |  | 5.0
Annual average floor price | $ / bbl | 67.2 |
Crude oil futures |  |
Financial risk management and financial instruments |  |
Contract/Notional amount - open positions | $ | $ 108.0 | $ 36.0
Ethane swap options |  |
Financial risk management and financial instruments |  |
Number of barrels - open positions | 4.0 | 21.5
Number of barrels - settled | 26.2 | 17.4
Annual average floor price | $ / gal | 23.2 | 19.8
Foreign exchange contracts |  |
Financial risk management and financial instruments |  |
Contract/Notional amount - open positions | $ | $ 262.0 | $ 481.0
Foreign exchange zero cost collars |  |
Financial risk management and financial instruments |  |
Contract/Notional amount - open positions | $ | 2,800.0 | 5,370.0
Contract/Notional amount - settled | $ | $ 5,370.0 | $ 4,725.0
Annual average floor price | R / $ | 14.54 | 14.80
Annual average cap price | R / $ | 17.52 | 17.77

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