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Discontinued Operations, Divestitures and Acquisitions - Acquisitions Narrative (Details) $ in Millions, $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) | Oct. 02, 2017 SGD ($) | Oct. 02, 2017 USD ($) | Aug. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  | $ 67.8 | $ 25.4 |  |
Goodwill |  |  |  |  | 1,951.9 |  | $ 1,951.9 | $ 1,939.8
Product Care |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,430.8 |  | 1,430.8 | 1,412.9
Food Care |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 521.1 |  | 521.1 | $ 526.9
AFP, Inc | Product Care |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired | 100.00% |  |  |  |  |  |  |
Total consideration transferred | $ 70.8 |  |  |  |  |  |  |
Cash acquired from acquisition | 2.9 |  |  |  |  |  |  |
Goodwill | $ 21.6 |  |  |  |  |  |  |
Fagerdala Singapore Pte Ltd. | Product Care |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired |  |  | 100.00% |  |  |  |  |
Total consideration transferred |  |  | $ 106.6 |  | 106.2 |  | (0.4) |
Cash acquired from acquisition |  |  | 13.3 |  |  |  |  |
Consideration transferred |  | $ 144.2 |  |  |  |  |  |
Goodwill |  |  | $ 39.3 |  | 37.8 |  | 37.8 |
Deltaplam Embalagens Industria e Comercio Ltda (Deltaplam) | Food Care |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 25.8 | 25.3 |  |  |
Goodwill |  |  |  | 8.1 | 9.7 |  | 9.7 |
Intangible assets assumed |  |  |  | $ 7.4 | $ 5.9 |  | $ 5.9 |

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