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Acquisitions - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 02, 2017 | Jun. 30, 2018 | Sep. 30, 2018
Sacramento Container Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition completion date | Oct. 02, 2017 |  |
Cash purchase price | $ 274.0 |  |
Adjustment to final valuation of intangible assets |  | $ 5.5 | $ 5.5
Decrease in other intangible assets with an offset to goodwill |  | $ (5.5) | $ (5.5)
Acquired finite-lived intangible assets, weighted average useful life | 9 years 7 months 6 days |  |
Sacramento Container Corporation | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Property, plant and equipment useful life | 1 year |  |
Sacramento Container Corporation | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Property, plant and equipment useful life | 13 years |  |
Northern Sheets LLC And Central California Sheets LLC |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of membership interests acquired | 100.00% |  |

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