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Goodwill and Other Intangible Assets - Purchased Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Acquired finite-lived intangible assets: |  |  |
Gross Value | $ 110.9 | $ 111.1 |
Accumulated Amortization | (95.8) | (85.4) |
Total | 15.1 | 25.7 |
Total intangible assets, Gross Value | 117.8 | 118.0 |
Total intangible assets, Net Value | 22.0 | 32.6 |
Aggregate amortization expense for finite-live intangible assets | 10.4 | 10.5 | $ 13.0
Trade names |  |  |
Acquired finite-lived intangible assets: |  |  |
Indefinite-lived trade names | 6.9 | 6.9 |
Customer relationships |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 53.7 | 53.7 |
Accumulated Amortization | (50.2) | (44.9) |
Total | 3.5 | 8.8 |
Contracts and backlog |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 30.8 | 30.8 |
Accumulated Amortization | (25.7) | (23.7) |
Total | 5.1 | 7.1 |
Developed technology and technical know-how |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 25.0 | 25.2 |
Accumulated Amortization | (18.6) | (15.7) |
Total | 6.4 | 9.5 |
Trade names |  |  |
Acquired finite-lived intangible assets: |  |  |
Gross Value | 1.4 | 1.4 |
Accumulated Amortization | (1.3) | (1.1) |
Total | $ 0.1 | $ 0.3 |

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