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Equity settled share-based transactions - Fair value of RSUs and key assumptions (Details) - Restricted Share Units | 12 Months Ended
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Dec. 31, 2021 $ / shares
Fair value of share options and key assumptions |
Exercise price | $ 0.01
Expected option life | 1 year
Expected dividends | 0.00%
Likelihood of achieving a redemption event | 5
Likelihood of achieving a liquidity event | 5
Bottom of range [member] |
Fair value of share options and key assumptions |
Fair value at measurement date | $ 13.89
Share price | $ 13.89
Expected volatility | 41.03%
Risk-free interest rate | 1.00%
Top of range [member] |
Fair value of share options and key assumptions |
Fair value at measurement date | $ 18.91
Share price | $ 18.91
Expected volatility | 44.26%
Risk-free interest rate | 1.13%

X
- Definition The exercise price of other equity instruments granted. + References No definition available. + Details
Name: | pre_ExercisePriceOtherEquityInstrumentsGranted
Namespace Prefix: | pre_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of an expected dividend used to calculate the fair value of other equity instruments granted. + References No definition available. + Details
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Namespace Prefix: | pre_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The option life of other equity instruments granted. + References No definition available. + Details
Name: | pre_ExpectedOptionLifeOtherEquityInstrumentsGranted
Namespace Prefix: | pre_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The expected volatility of the share price used to calculate the fair value of the other equity instruments granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References No definition available. + Details
Name: | pre_ExpectedVolatilityOtherEquityInstrumentsGranted
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- Definition The fair value share price used as input to the option pricing model to calculate the fair value of other equity instruments granted. + References No definition available. + Details
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Namespace Prefix: | pre_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition The likelihood of achieving a liquidity event, used as input to the option pricing model to calculate the fair value of other equity instruments granted. + References No definition available. + Details
Name: | pre_LikelihoodOfAchievingLiquidityEventOtherEquityInstrumentsGranted
Namespace Prefix: | pre_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition The likelihood of achieving a redemption event, used as input to the option pricing model to calculate the fair value of other equity instruments granted. + References No definition available. + Details
Name: | pre_LikelihoodOfAchievingRedemptionEventOtherEquityInstrumentsGranted
Namespace Prefix: | pre_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition The risk-free interest used to calculate the fair value of other equity instruments granted. + References No definition available. + Details
Name: | pre_RiskFreeInterestRateOtherEquityInstrumentsGranted
Namespace Prefix: | pre_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of other equity instruments granted. + References No definition available. + Details
Name: | pre_WeightedAverageSharePriceOtherEquityInstrumentsGranted
Namespace Prefix: | pre_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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- Details
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