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Investments, Forward Contracts and Fair Value Measurements - Available for Sale Securities Reconciliation (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jul. 01, 2017
Available-for-sale Debt Securities [Abstract]
Amortized Cost/ Carrying Cost	$ 205.5
Gross Unrealized Losses	(1.4)
Fair Value	204.1
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	27.8
Gross Unrealized Losses	(0.1)
Fair Value	27.7
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	17.7
Gross Unrealized Losses	(0.1)
Fair Value	17.6
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	2.8
Gross Unrealized Losses	(0.1)
Fair Value	2.7
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	30.0
Gross Unrealized Losses	(0.4)
Fair Value	29.6
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	127.2
Gross Unrealized Losses	(0.7)
Fair Value	$ 126.5
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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