Business Combinations, Goodwill and Acquired Intangible Assets - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Apr. 02, 2017	Mar. 28, 2017	Jan. 01, 2017
Total assets acquired
Goodwill	$ 1,671.0		$ 1,193.5
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Total assets acquired
Current assets, excluding cash acquired		$ 149.8
Property, plant and equipment		104.9
Goodwill		472.9
Acquired intangible assets		175.8
Other long-term assets		11.2
Total assets acquired		914.6
Total liabilities assumed
Current liabilities		(78.5)
Long-term liabilities		(95.5)
Total liabilities assumed		(174.0)
Cash paid, net of cash acquired		$ 740.6