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Business Combinations - Intangible Assets Acquired (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) |  | 13 years |  |
Customer relationships |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) |  | 13 years |  |
AXC |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) | 11 years |  |  |
Estimated Asset Fair Value | $ 201.4 |  |  |
Indefinite-lived intangible assets: |  |  |  |
Trademarks and trade names | 55.0 |  |  |
Total identifiable intangible assets acquired | $ 256.4 |  | $ 256.4 | $ 256.4
AXC | Customer relationships |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) | 14 years |  |  |
Estimated Asset Fair Value | $ 139.1 |  |  |
AXC | Unpatented technology |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) | 10 years |  |  |
Estimated Asset Fair Value | $ 42.1 |  |  |
AXC | Backlog |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) | 1 year |  |  |
Estimated Asset Fair Value | $ 19.2 |  |  |
AXC | Other identifiable intangible assets |  |  |  |
Acquired Finite-Lived Intangible Assets |  |  |  |
Weighted Average Useful Life (in years) | 4 years |  |  |
Estimated Asset Fair Value | $ 1.0 |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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