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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
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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

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- 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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