Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities -Fair value hedges (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended		12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 27, 2014	Dec. 28, 2013	Jun. 28, 2014
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (26.4)	$ 0
Fair Value Hedging [Member]
Derivative [Line Items]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0
Fair Value Hedging [Member] | Other Nonoperating Income (Expense) [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		0.9	0	(5.8)	0
Fair Value Hedging [Member] | Other Nonoperating Income (Expense) [Member] | Fixed-rate Debt [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ (4.1)	$ 0	$ 4.3	$ 0