Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014 item	Jun. 28, 2014	Mar. 28, 2015
Changes in goodwill
Balance at the beginning of the period	$ 267.0us-gaap_Goodwill		$ 267.0us-gaap_Goodwill
Currency translation adjustments			(8.5)
Balance at the end of the period		267.0us-gaap_Goodwill	258.5us-gaap_Goodwill
Number of reporting units	2us-gaap_NumberOfReportableSegments
Impairment of Goodwill
Impairment of goodwill	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Network Enablement
Changes in goodwill
Balance at the beginning of the period	158.0		158.0
Currency translation adjustments			(5.1)
Balance at the end of the period			152.9
Service Enablement
Changes in goodwill
Balance at the beginning of the period	94.8		94.8
Currency translation adjustments			(3.0)
Balance at the end of the period			91.8
Optical Security and Performance Products
Changes in goodwill
Balance at the end of the period		8.3	8.3
Communications and Commercial Optical Products
Changes in goodwill
Balance at the beginning of the period	5.9		5.9
Currency translation adjustments			(0.4)
Balance at the end of the period			$ 5.5