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Investments, Forward Contracts and Fair Value Measurements - Available for Sale Securities Reconciliation (Details) - USD ($) $ in Millions	Dec. 30, 2017	Jul. 01, 2017
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	$ 512.3
Gross Unrealized Losses	(1.0)
Fair Value	511.3
Total debt securities
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		$ 509.8
Gross Unrealized Gains		0.1
Gross Unrealized Losses		(0.8)
Fair Value		509.1
U.S. treasuries
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	94.1
Gross Unrealized Losses	(0.1)
Fair Value	94.0
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		56.8
Gross Unrealized Gains		0.0
Gross Unrealized Losses		(0.1)
Fair Value		56.7
U.S. agencies
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	23.0
Gross Unrealized Losses	(0.1)
Fair Value	22.9
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		45.0
Gross Unrealized Gains		0.0
Gross Unrealized Losses		(0.1)
Fair Value		44.9
Municipal bonds and sovereign debt instruments
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	2.9
Gross Unrealized Losses	0.0
Fair Value	2.9
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		4.4
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Fair Value		4.4
Asset-backed securities
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	55.9
Gross Unrealized Losses	(0.4)
Fair Value	55.5
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		71.5
Gross Unrealized Gains		0.0
Gross Unrealized Losses		(0.4)
Fair Value		71.1
Corporate securities
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	336.4
Gross Unrealized Losses	(0.4)
Fair Value	$ 336.0
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		326.1
Gross Unrealized Gains		0.1
Gross Unrealized Losses		(0.2)
Fair Value		326.0
Certificates of deposit
Available-for-sale Securities [Abstract]
Amortized Cost/ Carrying Cost		6.0
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Fair Value		$ 6.0

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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