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Acquisitions - Schedule of Business Acquisitions, by Acquisition (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 917.3 | $ 883.2 | $ 737.9
Packaging |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 862.1 | 828.0 | $ 682.7
Sacramento Container Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets |  | 67.1 | 72.6 |
Property, plant and equipment |  | 26.7 | 26.7 |
Other net assets |  | 23.4 | 23.4 |
Net assets acquired |  | 273.8 | 273.8 |
Goodwill, Adjustments |  | 5.5 |  |
Other intangible assets, Adjustments | $ (5.5) | (5.5) |  |
Sacramento Container Corporation | Packaging |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 156.6 | $ 151.1 |

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