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Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 25, 2023 | Jun. 30, 2024 | Jun. 25, 2023 | Dec. 31, 2023
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | $ 188.3 |  | $ 188.3 |  | $ 188.3
Accumulated Amortization | (137.1) |  | (137.1) |  | (132.8)
Net Value | 51.2 |  | 51.2 |  | 55.5
Total intangible assets, Gross value | 195.2 |  | 195.2 |  | 195.2
Total intangible assets, Net value | 58.1 |  | 58.1 |  | 62.4
Aggregate amortization expense for finite-lived intangible assets | 2.2 | $ 1.4 | 4.3 | $ 3.0 |
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 | 80.9 |  | 80.9 |  | 80.9
Accumulated Amortization | (64.0) |  | (64.0) |  | (62.8)
Net Value | 16.9 |  | 16.9 |  | 18.1
Contracts and backlog |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 53.1 |  | 53.1 |  | 53.1
Accumulated Amortization | (41.0) |  | (41.0) |  | (38.8)
Net Value | 12.1 |  | 12.1 |  | 14.3
Developed technology and technical know-how |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 33.7 |  | 33.7 |  | 33.7
Accumulated Amortization | (28.8) |  | (28.8) |  | (28.2)
Net Value | 4.9 |  | 4.9 |  | 5.5
Trade names |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 3.8 |  | 3.8 |  | 3.8
Accumulated Amortization | (2.9) |  | (2.9) |  | (2.7)
Net Value | 0.9 |  | 0.9 |  | 1.1
In-process research and development |  |  |  |  |
Acquired finite-lived intangible assets: |  |  |  |  |
Gross Value | 16.8 |  | 16.8 |  | 16.8
Accumulated Amortization | (0.4) |  | (0.4) |  | (0.3)
Net Value | $ 16.4 |  | $ 16.4 |  | $ 16.5

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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