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Goodwill and Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jul. 01, 2018 | Jun. 25, 2017 | Dec. 31, 2017
Acquired finite-lived intangible assets: |  |  |
Gross Value | $ 108.9 |  | $ 108.9
Accumulated Amortization | (97.0) |  | (93.8)
Net Value | 11.9 |  | 15.1
Total intangible assets: Gross Value | 115.8 |  | 115.8
Total intangible assets: Net Value | 18.8 |  | 22.0
Aggregate amortization expense for finite-lived intangible assets | 3.2 | $ 5.3 |
Trade names |  |  |
Acquired finite-lived intangible assets: |  |  |
Indefinite-lived trade names | 6.9 |  | 6.9
Customer relationships |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 52.6 |  | 52.6
Accumulated Amortization | (49.9) |  | (49.1)
Net Value | 2.7 |  | 3.5
Contracts and backlog |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 29.9 |  | 29.9
Accumulated Amortization | (25.7) |  | (24.8)
Net Value | 4.2 |  | 5.1
Developed technology and technical know-how |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 25.0 |  | 25.0
Accumulated Amortization | (20.0) |  | (18.6)
Net Value | 5.0 |  | 6.4
Trade names |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 1.4 |  | 1.4
Accumulated Amortization | (1.4) |  | (1.3)
Net Value | $ 0.0 |  | $ 0.1

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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=109223946&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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