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Acquisitions and Divestitures - Allocation of Acquisition Costs to Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Feb. 28, 2020 | Dec. 31, 2019 | Jul. 18, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,895,574 |  | $ 1,779,745 |  | $ 1,697,955
Flow MD |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash acquired |  | $ 32,858 |  |  |
Property, plant and equipment |  | 4,166 |  |  |
Goodwill |  | 60,431 |  |  |
Intangible assets |  | 53,000 |  |  |
Other noncurrent assets |  | 1,344 |  |  |
Total assets acquired |  | 151,799 |  |  |
Current liabilities |  | (32,291) |  |  |
Deferred income taxes |  | 2,054 |  |  |
Other noncurrent liabilities |  | (329) |  |  |
Net assets acquired |  | $ 121,233 |  |  |
Velcora Holding AB |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash acquired |  |  |  | $ 20,248 |
Property, plant and equipment |  |  |  | 1,656 |
Goodwill |  |  |  | 86,613 |
Intangible assets |  |  |  | 48,183 |
Other noncurrent assets |  |  |  | 788 |
Total assets acquired |  |  |  | 157,488 |
Current liabilities |  |  |  | (7,630) |
Long-term borrowings |  |  |  | (51,130) |
Deferred income taxes |  |  |  | (11,094) |
Other noncurrent liabilities |  |  |  | (454) |
Net assets acquired |  |  |  | $ 87,180 |

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