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Rationalization Charges - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |
Restructuring reserve | $ 43,141 | $ 41,560
Other Restructuring | Rationalization Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Remaining expenses | 1,200 |
Remaining cash expenditures | 5,900 |
Annually Through 2040 | Central States Pension Plan withdrawal |  |
Restructuring Cost and Reserve [Line Items] |  |
Remaining cash expenditures | 3,100 |
Accretion expense | 1,100 |
Accrued Liabilities |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring reserve | 7,100 |
Other Liabilities |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring reserve | $ 36,000 |

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