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Investments, Forward Contracts and Fair Value Measurements - Amortized Cost to Fair Value Reconciliation (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jul. 01, 2017
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	$ 190.8	$ 509.8
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(1.2)	(0.8)
Estimated Fair Value	189.6	509.1
U.S. treasuries
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	36.0	56.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Fair Value	35.9	56.7
U.S. agencies
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	13.3	45.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Fair Value	13.2	44.9
Municipal bonds and sovereign debt instruments
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	2.7	4.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Estimated Fair Value	2.7	4.4
Asset-backed securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	23.9	71.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.4)	(0.4)
Estimated Fair Value	23.5	71.1
Corporate securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	114.9	326.1
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(0.6)	(0.2)
Estimated Fair Value	$ 114.3	326.0
Certificates of deposit
Available-For-Sale Investments
Amortized Cost/ Carrying Cost		6.0
Gross Unrealized Gains		0.0
Gross Unrealized Losses		0.0
Estimated Fair Value		$ 6.0

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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