Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2016	Mar. 28, 2015	Dec. 31, 2015
Unrealized Gain (Loss) on Investments [Abstract]
Equity securities, at cost less impairments	$ 21.9		$ 6.4
Gross unrealized gains	19.2		9.3
Gross unrealized losses	(2.5)		(0.8)
Estimated fair value of equity securities	38.6		14.9
Loss from equity method investments	2.4	$ 0.3
Transfer from investments	15.5
Unrealized gain (loss) on investments	8.7
Other non-current assets
Unrealized Gain (Loss) on Investments [Abstract]
Cost method investments	7.1		6.9
Equity method investments	$ 28.7		$ 45.5