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Goodwill - Changes in Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 30, 2018
Changes in goodwill |  |  |
Balance at the beginning of the period | $ 381.1 | $ 336.3 |
Acquisitions | 4.3 | 46.1 |
Other |  | 3.7 |
Currency translation and other adjustments | (4.0) | (5.0) |
Balance at the end of the period | 381.4 | 381.1 |
Network Enablement |  |  |
Changes in goodwill |  |  |
Balance at the beginning of the period | 338.9 | 328.0 |
Acquisitions | 0.0 | 12.2 |
Other |  | 3.7 |
Currency translation and other adjustments | (4.0) | (5.0) |
Balance at the end of the period | 334.9 | 338.9 |
Goodwill balance | 636.8 | 640.8 | $ 629.9
Accumulated impairment losses | 301.9 | 301.9 | 301.9
Service Enablement |  |  |
Changes in goodwill |  |  |
Balance at the beginning of the period | 0.0 | 0.0 |
Acquisitions | 4.3 | 0.0 |
Other |  | 0.0 |
Currency translation and other adjustments | 0.0 | 0.0 |
Balance at the end of the period | 4.3 | 0.0 |
Goodwill balance | 276.9 | 272.6 | 272.6
Accumulated impairment losses | 272.6 | 272.6 | 272.6
Optical Security and Performance Products |  |  |
Changes in goodwill |  |  |
Balance at the beginning of the period | 42.2 | 8.3 |
Acquisitions | 0.0 | 33.9 |
Balance at the end of the period | 42.2 | 42.2 |
Goodwill balance | 126.7 | 126.7 | 92.8
Accumulated impairment losses | $ 84.5 | $ 84.5 | $ 84.5

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