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Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 29, 2019
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | $ 147.5 |  | $ 147.5 |  | $ 139.7
Accumulated Amortization | (112.4) |  | (112.4) |  | (107.1)
Net Value | 35.1 |  | 35.1 |  | 32.6
Total intangible assets: gross value | 154.4 |  | 154.4 |  | 146.6
Total intangible assets: net value | 42.0 |  | 42.0 |  | 39.5
Aggregate amortization expense for finite-lived intangible assets | 1.7 | $ 1.7 | 5.4 | $ 5.2 |
Trade names |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Indefinite-lived trade names | 6.9 |  | 6.9 |  | 6.9
Customer relationships |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 75.0 |  | 75.0 |  | 72.3
Accumulated Amortization | (55.2) |  | (55.2) |  | (53.3)
Net Value | 19.8 |  | 19.8 |  | 19.0
Contracts and backlog |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 32.7 |  | 32.7 |  | 32.0
Accumulated Amortization | (30.3) |  | (30.3) |  | (28.4)
Net Value | 2.4 |  | 2.4 |  | 3.6
Developed technology and technical know-how |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 28.6 |  | 28.6 |  | 25.0
Accumulated Amortization | (25.1) |  | (25.1) |  | (23.8)
Net Value | 3.5 |  | 3.5 |  | 1.2
Trade names |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 2.0 |  | 2.0 |  | 1.9
Accumulated Amortization | (1.8) |  | (1.8) |  | (1.6)
Net Value | 0.2 |  | 0.2 |  | 0.3
In-process research and development |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 9.2 |  | 9.2 |  | 8.5
Accumulated Amortization | 0.0 |  | 0.0 |  | 0.0
Net Value | $ 9.2 |  | $ 9.2 |  | $ 8.5

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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