Business Combinations, Goodwill and Acquired Intangible Assets - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Mar. 28, 2017	Oct. 01, 2017	Jan. 01, 2017
Total assets acquired
Goodwill		$ 1,748.9	$ 1,193.5
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Total assets acquired
Current assets, excluding cash acquired	$ 152.3
Property, plant and equipment	104.7
Goodwill	471.1
Acquired intangible assets	173.4
Other long-term assets	8.9
Total assets acquired	910.4
Total liabilities assumed
Current liabilities	(78.7)
Long-term liabilities	(89.3)
Total liabilities assumed	(168.0)
Consideration transferred, net of cash acquired (b)	742.4
Payment for liability to former share option holders	$ 2.0