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Employee Benefits (Actuarial Assumptions) (Details) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Discount rate as at the end of the year [Member] |  |  |
Actuarial assumptions [Line Items] |  |  |
Principal actuarial assumptions | 1.70% | 2.10% | 3.00%
Future salary increases [Member] |  |  |
Actuarial assumptions [Line Items] |  |  |
Principal actuarial assumptions | 3.40% | 3.20% | 3.30%
Future pension increase [Member] |  |  |
Actuarial assumptions [Line Items] |  |  |
Principal actuarial assumptions | 2.00% | 2.10% | 2.20%

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