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Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2021 | Sep. 27, 2020 | Sep. 26, 2021 | Sep. 27, 2020 | Dec. 27, 2020
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | $ 150.0 |  | $ 150.0 |  | $ 150.0
Accumulated Amortization | (117.6) |  | (117.6) |  | (113.9)
Net Value | 32.4 |  | 32.4 |  | 36.1
Total intangible assets: gross value | 156.9 |  | 156.9 |  | 156.9
Total intangible assets: net value | 39.3 |  | 39.3 |  | 43.0
Aggregate amortization expense for finite-lived intangible assets | 1.1 | $ 1.7 | 3.7 | $ 5.4 |
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 | 75.3 |  | 75.3 |  | 75.3
Accumulated Amortization | (57.1) |  | (57.1) |  | (55.7)
Net Value | 18.2 |  | 18.2 |  | 19.6
Contracts and backlog |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 33.4 |  | 33.4 |  | 33.4
Accumulated Amortization | (32.7) |  | (32.7) |  | (31.0)
Net Value | 0.7 |  | 0.7 |  | 2.4
Developed technology and technical know-how |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 29.9 |  | 29.9 |  | 29.9
Accumulated Amortization | (25.7) |  | (25.7) |  | (25.3)
Net Value | 4.2 |  | 4.2 |  | 4.6
Trade names |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 2.0 |  | 2.0 |  | 2.0
Accumulated Amortization | (2.0) |  | (2.0) |  | (1.9)
Net Value | 0.0 |  | 0.0 |  | 0.1
In-process research and development |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 9.4 |  | 9.4 |  | 9.4
Accumulated Amortization | (0.1) |  | (0.1) |  | 0.0
Net Value | $ 9.3 |  | $ 9.3 |  | $ 9.4

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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=123570139&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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