Business Combinations, Goodwill and Acquired Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 28, 2017	Apr. 02, 2017	Jan. 01, 2017
Business Acquisition [Line Items]
Total intangibles subject to amortization		$ 7.2
Goodwill		$ 1,671.0	$ 1,193.5
e2v
Business Acquisition [Line Items]
Total intangibles subject to amortization	$ 129.8
Weighted average useful life in years	10 years
Total acquired intangible assets	$ 175.8
Goodwill	472.9
Trademarks | e2v
Business Acquisition [Line Items]
Intangibles not subject to amortization:(a)	46.0
Proprietary technology | e2v
Business Acquisition [Line Items]
Total intangibles subject to amortization	$ 104.8
Weighted average useful life in years	10 years
Customer list/relationships | e2v
Business Acquisition [Line Items]
Total intangibles subject to amortization	$ 22.2
Weighted average useful life in years	10 years
Backlog | e2v
Business Acquisition [Line Items]
Total intangibles subject to amortization	$ 2.8
Weighted average useful life in years	9 months