Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2016	Mar. 28, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Loss from equity method investments	$ (2.4)	$ (0.3)
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)
Transfer from investments	15.5
Unrealized gain (loss) on investments	8.7
Available-for-sale securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Estimated fair value of equity securities	38.6		14.9
Other non-current assets [Member]
Schedule of Equity Method Investments [Line Items]
Cost method investments	7.1		6.9
Equity method investments	$ 28.7		$ 45.5