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Goodwill and Other Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016
Acquired finite-lived intangible assets: |  |  |
Gross Value | $ 108.9 | $ 108.9 |
Accumulated Amortization | (99.7) | (93.8) |
Total | 9.2 | 15.1 |
Total intangible assets, Gross Value | 115.8 | 115.8 |
Total intangible assets, Net Value | 16.1 | 22.0 |
Aggregate amortization expense for finite-live intangible assets | 5.9 | 10.4 | $ 10.5
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 | (50.6) | (49.1) |
Total | 2.0 | 3.5 |
Contracts and backlog |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 29.9 | 29.9 |
Accumulated Amortization | (26.4) | (24.8) |
Total | 3.5 | 5.1 |
Developed technology and technical know-how |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 25.0 | 25.0 |
Accumulated Amortization | (21.3) | (18.6) |
Total | 3.7 | 6.4 |
Trade names |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 1.4 | 1.4 |
Accumulated Amortization | (1.4) | (1.3) |
Total | $ 0.0 | $ 0.1 |

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