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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Details) - Sacramento Container Corporation - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 31, 2017
Finite Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets |  | $ 67.1 | $ 72.6 |
Decrease in other intangible assets with an offset to goodwill | $ (5.5) | $ (5.5) |  |
Customer Relationships |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets | 61.9 |  |  | $ 68.4
Trademarks and Trade Names |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets | $ 5.1 |  |  | 4.1
Other Intangible Assets |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets |  |  |  | $ 0.1

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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