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Acquisitions - Acquisitions Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2019 | Jul. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 2,196.4 |  | $ 2,216.9 |  |  | $ 2,196.4
Protective |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | 1,676.3 |  | 1,689.0 |  |  | 1,676.3
Automated Packaging Systems | Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Taxes paid for second quarter 2020 |  | $ 2.5 |  |  |  |  |  |
Automated Packaging Systems | Protective |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired | 100.00% |  |  |  |  |  |  |
Consideration transferred | $ 441.4 |  |  |  |  |  |  |
Liabilities assumed related to deferred incentive compensation plan | 58.2 |  |  |  |  |  |  |
Deferred compensation paid |  |  | 16.5 |  | $ 19.7 |  |  |
Acquisition related costs |  |  |  |  |  |  |  | 0.3
Adjustment to consideration transferred |  |  |  | $ (4.3) |  |  |  |
Goodwill | $ 261.3 |  | $ 246.8 |  |  |  |  | $ 246.8
Other 2019 Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 23.4 |
Goodwill |  |  |  |  |  |  | $ 6.0 |
Goodwill increase |  |  |  |  |  | $ 0.3 |  |

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