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Investments and Fair Value Measurements (Details) - USD ($) $ in Millions	Oct. 01, 2016	Jul. 02, 2016
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	$ 469.0	$ 410.0
Gross Unrealized Gains	112.3	109.5
Gross Unrealized Losses	(0.4)	(0.4)
Fair Value	580.9	519.1
Debt securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	440.0	347.9
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses	(0.4)	(0.4)
Fair Value	439.8	347.8
U.S. treasuries
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	54.1	46.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	54.1	46.1
U.S. agencies
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	37.6	24.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	37.6	24.9
Municipal bonds and sovereign debt instruments
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	4.8	2.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	4.8	2.0
Asset-backed securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	61.1	50.4
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(0.3)	(0.3)
Fair Value	60.9	50.2
Corporate securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	276.3	224.5
Gross Unrealized Gains	0.1	0.2
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	276.3	224.6
Certificates of deposits
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	6.1
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	6.1
Marketable equity securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	29.0	62.1
Gross Unrealized Gains	112.1	109.2
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 141.1	$ 171.3

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