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Acquisitions - Schedule of Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 888.7 | $ 883.2
Packaging |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  | 833.5 | 828.0
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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