Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Impairment loss			$ 47.5		$ 45.3
Amortization of acquisition-related intangible assets	$ 23.5	$ 33.6	47.2	$ 67.5
Intangible assets, net	276.8		276.8		325.8
IPRD
Finite-Lived Intangible Assets [Line Items]
IPRD projects reclassified to developed technology	0.5		1.9
Impairment loss	2.2		6.0		3.8
Intangible assets, net	$ 33.5		$ 33.5		$ 37.6