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Pensions (Details)	12 Months Ended
	Dec. 31, 2021 trustee
Pensions
Portion of final pensionable salary, considered for pension	1.67%
Maximum number of years of service for pension	40 years
Maximum annual salary inflation	2.00%
Main Scheme
Pensions
Number of nominated trustee directors	4
Number of appointed trustee directors	6

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The maximum percentage of annual salary inflation.

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- Definition

Represents the maximum number of years of service considerable for pension calculations.

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- Definition

The number of trustee directors appointed under the main scheme.

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- Definition

The number of trustee directors nominated by members selected from eligible active staff and pensioner members who apply under the main scheme.

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- Definition

Represents the portion of final pensionable salary for each year of service prior to retirement, provide a pension.

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