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Investments, Forward Contracts and Fair Value Measurements - Amortized Cost to Fair Value Reconciliation (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jul. 01, 2017
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	$ 499.9
Gross Unrealized Gains	0.1
Gross Unrealized Losses	(0.7)
Fair Value	499.3
Total debt securities
Available-For-Sale Investments
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 Investments
Amortized Cost/ Carrying Cost	88.5	56.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	88.4	56.7
U.S. agencies
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	13.9	45.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value	13.8	44.9
Municipal bonds and sovereign debt instruments
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	4.4	4.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	4.4	4.4
Asset-backed securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	62.7	71.5
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.4)	(0.4)
Fair Value	62.3	71.1
Corporate securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	330.4	326.1
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(0.1)	(0.2)
Fair Value	$ 330.4	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
Fair Value		$ 6.0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB
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