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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
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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

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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