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Acquisitions - Summary of Preliminary Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2019 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration transferred |  |  |  | $ (1.5) | $ 452.6 |
Assets: |  |  |  |  |  |
Goodwill |  | $ 2,207.7 |  | 2,207.7 |  | $ 2,216.9
Protective |  |  |  |  |  |
Assets: |  |  |  |  |  |
Goodwill |  | 1,684.2 |  | 1,684.2 |  | $ 1,689.0
Automated Packaging Systems |  |  |  |  |  |
Assets: |  |  |  |  |  |
Identifiable intangible assets, net | $ 80.5 |  |  |  |  |
Measurement Period |  |  |  |  |  |
Property and equipment, net | 2.4 |  |  |  |  |
Automated Packaging Systems | Protective |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration transferred | 445.7 |  |  | 441.4 |  |
Assets: |  |  |  |  |  |
Cash and cash equivalents | 16.0 | 15.8 |  | 15.8 |  |
Trade receivables, net | 37.3 | 37.3 |  | 37.3 |  |
Other receivables | 0.3 | 0.3 |  | 0.3 |  |
Inventories, net | 40.7 | 40.0 |  | 40.0 |  |
Prepaid expenses and other current assets | 2.3 | 2.3 |  | 2.3 |  |
Property and equipment, net | 76.9 | 85.6 |  | 85.6 |  |
Identifiable intangible assets, net | 81.1 | 80.5 |  | 80.5 |  |
Goodwill | 261.3 | 246.7 |  | 246.7 |  |
Operating lease right-of-use-assets |  | 4.3 |  | 4.3 |  |
Other non-current assets | 24.7 | 25.8 |  | 25.8 |  |
Total assets | 540.6 | 538.6 |  | 538.6 |  |
Liabilities: |  |  |  |  |  |
Accounts payable | 12.0 | 12.0 |  | 12.0 |  |
Current portion of long-term debt | 2.6 | 2.1 |  | 2.1 |  |
Current portion of operating lease liabilities |  | 1.5 |  | 1.5 |  |
Other current liabilities | 56.2 | 52.9 |  | 52.9 |  |
Long-term debt, less current portion | 4.3 | 4.0 |  | 4.0 |  |
Long-term operating lease liabilities, less current portion |  | 2.8 |  | 2.8 |  |
Deferred taxes |  | 0.5 |  | 0.5 |  |
Other noncurrent liabilities | 19.8 | 21.4 |  | 21.4 |  |
Total liabilities | $ 94.9 | 97.2 |  | $ 97.2 |  |
Measurement Period |  |  |  |  |  |
Adjustment to consideration transferred |  |  | $ (4.3) |  |  |
Cash and cash equivalents |  | (0.2) |  |  |  |
Inventories, net |  | (0.7) |  |  |  |
Property and equipment, net |  | 8.7 |  |  |  |
Identifiable intangible assets, net |  | (0.6) |  |  |  |
Goodwill |  | (14.6) |  |  |  |
Operating lease right-of-use-assets |  | 4.3 |  |  |  |
Other non-current assets |  | 1.1 |  |  |  |
Total assets |  | (2.0) |  |  |  |
Current portion of long-term debt |  | (0.5) |  |  |  |
Current portion of operating lease liabilities |  | 1.5 |  |  |  |
Other current liabilities |  | (3.3) |  |  |  |
Long-term debt, less current portion |  | (0.3) |  |  |  |
Long-term operating lease liabilities, less current portion |  | 2.8 |  |  |  |
Deferred taxes |  | 0.5 |  |  |  |
Other noncurrent liabilities |  | 1.6 |  |  |  |
Total liabilities |  | $ 2.3 |  |  |  |

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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