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Investments, Forward Contracts and Fair Value Measurements - Available for Sale Securities Reconciliation (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Jun. 30, 2018
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Available-for-sale Debt Securities [Abstract] |  |
Amortized Cost/ Carrying Cost | $ 51.5 | $ 190.8
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.8) | (1.2)
Fair Value | 50.7 | 189.6
U.S. treasuries |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized Cost/ Carrying Cost | 4.0 | 36.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | (0.1)
Fair Value | 4.0 | 35.9
U.S. agencies |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized Cost/ Carrying Cost | 8.8 | 13.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | (0.1)
Fair Value | 8.7 | 13.2
Municipal bonds and sovereign debt instruments |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized Cost/ Carrying Cost | 2.7 | 2.7
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 2.7 | 2.7
Asset-backed securities |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized Cost/ Carrying Cost | 7.0 | 23.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.3) | (0.4)
Fair Value | 6.7 | 23.5
Corporate securities |  |
Available-for-sale Debt Securities [Abstract] |  |
Amortized Cost/ Carrying Cost | 29.0 | 114.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.4) | (0.6)
Fair Value | $ 28.6 | $ 114.3

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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 Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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