Investments Available for Sale Securities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Jun. 28, 2014	Jun. 27, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 10.7	$ 10.7
Net unrealized investment gains (losses):
Equity securities, at cost less impairments	6.4	6.4	$ 17.1	$ 17.1
Gross unrealized gains	9.3	9.3	3.8	5.7
Gross unrealized losses	(0.8)	(0.8)	(0.2)	(10.1)
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Losses			9.9
Net unrealized investment gains (losses):
Estimated fair value of equity securities	$ 14.9	$ 14.9	20.7	$ 12.7
Other Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities			5.9
Other Noncurrent Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities			$ 14.8