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Employee Benefit Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated losses, excess percentage threshold required on projected benefit obligation | 10.00% |
Fair value of plan assets at plan year end | $ 267.2 | $ 1,100.0
Packaging Corporation of America | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Average remaining service period of active employees used for recognition of market-related value of assets | 6 years |
Packaging Corporation of America | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Average remaining service period of active employees used for recognition of market-related value of assets | 9 years |

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