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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |
Beginning Balance | $ 883.2 | $ 737.9
Ending Balance | 917.3 | 883.2
Sacramento Container Corporation and TimBar and Columbus Container |  |
Goodwill [Line Items] |  |
Acquisitions |  | 145.3
Sacramento Container and Englander |  |
Goodwill [Line Items] |  |
Acquisitions | 34.1 |
Packaging |  |
Goodwill [Line Items] |  |
Beginning Balance | 828.0 | 682.7
Ending Balance | 862.1 | 828.0
Packaging | Sacramento Container Corporation and TimBar and Columbus Container |  |
Goodwill [Line Items] |  |
Acquisitions |  | 145.3
Packaging | Sacramento Container and Englander |  |
Goodwill [Line Items] |  |
Acquisitions | 34.1 |
Paper |  |
Goodwill [Line Items] |  |
Beginning Balance | 55.2 | 55.2
Ending Balance | $ 55.2 | $ 55.2

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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