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Goodwill (Details)
$ in Millions
 3 Months Ended
Sep. 27, 2025
USD ($)
Changes in goodwill  
Balance at the beginning of the period $ 595.7
Currency translation (3.4)
Balance at the end of the period 592.3
Network and Service Enablement  
Changes in goodwill  
Balance at the beginning of the period 553.5
Currency translation (3.4)
Balance at the end of the period 550.1
Optical Security and Performance Products  
Changes in goodwill  
Balance at the beginning of the period 42.2
Currency translation 0.0
Balance at the end of the period $ 42.2