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Employee benefit plans - Additional Information (Details) | 12 Months Ended | 141 Months Ended
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Dec. 31, 2022 USD ($) year participant | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plans, accumulated benefit obligation | $ 347,608,000 | $ 504,944,000 |  |
Projected benefit obligation (PBO) with accumulated benefit obligations in excess of plan assets | 176,702,000 | 228,127,000 |  |
Accumulated benefit obligation (ABO) with accumulated benefit obligations in excess of plan assets | 171,705,000 | 223,657,000 |  |
Fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets | 48,277,000 | 61,686,000 |  |
Projected contributions to retirement plan | $ 15,000,000 |  |  |
Percentage of retiree health liability | 96.00% |  |  |
Total postretirement benefit plan assets | $ 265,875,000 | $ 431,047,000 |  |
Total postretirement benefit plan assets (percent) | 92.00% |  |  |
U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 100.00% | 100.00% |  |
Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 100.00% | 100.00% |  |
United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 100.00% | 100.00% |  |
Equity securities | U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current target allocation for investment portfolio | 20.00% |  |  |
Equity securities | Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current target allocation for investment portfolio | 28.00% |  |  |
Debt securities | U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current target allocation for investment portfolio | 80.00% |  |  |
Debt securities | Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current target allocation for investment portfolio | 72.00% |  |  |
Sonoco Savings Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan contribution percentage, minimum | 1.00% |  |  |
Defined contribution plan contribution percentage, maximum | 100.00% |  |  |
Defined contribution plan, employer matching contribution (percent) | 100.00% |  |  |
Employer matching contribution, percent of employees' gross pay (percent) | 6.00% |  |  |
Percentage of participants modified matching contribution to be matched towards safe Harbor under companies savings plan |  |  |  | 50.00%
Modify matching employee contribution to profit sharing under companies savings plan |  |  |  | 4.00%
Companies expense related to the plan | $ 38,900,000 | $ 13,900,000 | $ 13,700,000 |
Sonoco Investment and Retirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Companies expense related to the plan | $ 0 | 22,914,000 | 23,505,000 |
Contribution rate of annual eligible earnings under companies investment and retirement plan | 4.00% |  |  |
Contribution rate of annual eligible earnings in excess of social security wage base under companies investment and retirement plan | 4.00% |  |  |
Vesting period | 3 years |  |  |
Age limit of participants (year) | year | 55 |  |  |
Cash contributions to the SIRP | $ 21,948,000 | 22,665,000 | 22,503,000 |
Retirement Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets | 253,125,000 | 417,105,000 | 1,799,109,000 |
Retirement Plans | Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-cash settlement charges | $ 479,000 | $ 11,984,000 |  |
Retirement Plans | Equity securities | U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 22.60% | 32.80% |  |
Retirement Plans | Equity securities | Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 34.00% | 33.60% |  |
Retirement Plans | Equity securities | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 23.40% | 23.50% |  |
Retirement Plans | Debt securities | U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 76.30% | 66.60% |  |
Retirement Plans | Debt securities | Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 66.00% | 66.40% |  |
Retirement Plans | Debt securities | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 72.90% | 72.00% |  |
Retirement Plans | Cash and short-term investments | U.K. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 1.10% | 0.60% |  |
Retirement Plans | Cash and short-term investments | Canada |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 0.00% | 0.00% |  |
Retirement Plans | Cash and short-term investments | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 3.70% | 4.50% |  |
Retirement Plans | Inactive Plan Investment Portfolio |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected contributions to retirement plan | $ 124,432,000 |  |  |
Expected settlement charge | $ 538,722,000 |  |  |
Number of participants | participant | 11,000 |  |  |
Retirement Plans | Active Plan Investment Portfolio |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of participants | participant | 700 |  |  |
Retirement Plans | Active Plan Investment Portfolio | Equity securities | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current target allocation for investment portfolio | 20.00% |  |  |
Retirement Plans | Active Plan Investment Portfolio | Debt securities | United States |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Current target allocation for investment portfolio | 80.00% |  |  |
Retiree Health and Life Insurance Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets | $ 12,750,000 | $ 13,942,000 | $ 14,026,000 |
Total postretirement benefit plan assets (percent) | 100.00% | 100.00% |  |
Retiree Health and Life Insurance Plans | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 0.00% | 0.00% |  |
Retiree Health and Life Insurance Plans | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 100.00% | 100.00% |  |
Retiree Health and Life Insurance Plans | Cash and short-term investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total postretirement benefit plan assets (percent) | 0.00% | 0.00% |  |

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