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Business Combinations - Net Asset Acquired (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Oct. 01, 2020 | Dec. 31, 2018
Net assets acquired: |  |  |  |  |  |
Goodwill |  | $ 817,600 | $ 811,400 | $ 865,900 | $ 817,600 | $ 487,200
Adjustments |  |  |  |  |  |
Goodwill |  | $ 400 | 38,400 |  |  |
AXC |  |  |  |  |  |
Net assets acquired: |  |  |  |  |  |
Identifiable intangible assets | $ 256,400 |  | 256,400 |  |  |
Goodwill | 287,900 |  | 287,500 |  |  |
Property, plant and equipment | 34,200 |  | 34,200 |  |  |
Other net assets | 53,100 |  | 53,100 |  |  |
Liabilities | (31,900) |  | (31,500) |  |  |
Net assets acquired | 599,700 |  | $ 599,700 |  |  |
Adjustments |  |  |  |  |  |
Goodwill | 400 |  |  |  |  |
Liabilities | (400) |  |  |  |  |
Net assets acquired | $ 0 |  |  |  |  |

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