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Defined benefit and 401(k) savings plan - Weighted Average Assumptions (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Retirement Benefits [Abstract]    
Discount rate 2.10% 0.30%
Expected rate of return 3.50% 3.00%
Rate of future compensation increases 1.80% 1.40%