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Investments, Forward Contracts and Fair Value Measurements - Measured at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Jul. 02, 2016
--- | --- | ---
Cash and cash equivalents |  |
Assets: |  |
Total assets |  | $ 295.4
Short-term investments |  |
Assets: |  |
Total assets |  | 484.7
Restricted cash |  |
Assets: |  |
Total assets |  | 11.3
Other non-current assets |  |
Assets: |  |
Total assets |  | 4.5
Other current liabilities |  |
Liability: |  |
Total liabilities | $ 9.6 |
Recurring basis | Cash and cash equivalents |  |
Assets: |  |
Total assets | 314.0 |
Recurring basis | Short-term investments |  |
Assets: |  |
Total assets | 498.0 |
Recurring basis | Restricted cash |  |
Assets: |  |
Total assets | 11.0 |
Recurring basis | Other non-current assets |  |
Assets: |  |
Total assets | 4.8 |
Recurring basis | Prepayments and other current assets |  |
Assets: |  |
Total assets | 4.0 |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total debt available-for-sale securities | 67.5 | 46.1
Marketable equity securities | 64.3 | 171.3
Money market funds | 283.1 | 274.4
Trading securities | 2.5 | 2.4
Foreign currency forward contracts | 0.0 | 0.0
Total assets | 417.4 | 494.2
Liability: |  |
Foreign currency forward contracts | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries |  |
Assets: |  |
Total debt available-for-sale securities | 67.5 | 46.1
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agencies |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds and sovereign debt instruments |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposits |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total debt available-for-sale securities | 410.4 | 301.7
Marketable equity securities | 0.0 | 0.0
Money market funds | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Foreign currency forward contracts | 4.0 | 0.0
Total assets | 414.4 | 301.7
Liability: |  |
Foreign currency forward contracts | 9.6 | 0.0
Total liabilities | 9.6 | 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasuries |  |
Assets: |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. agencies |  |
Assets: |  |
Total debt available-for-sale securities | 36.4 | 24.9
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments |  |
Assets: |  |
Total debt available-for-sale securities | 3.5 | 2.0
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets: |  |
Total debt available-for-sale securities | 62.6 | 50.2
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities |  |
Assets: |  |
Total debt available-for-sale securities | 301.9 | 224.6
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificates of deposits |  |
Assets: |  |
Total debt available-for-sale securities | 6.0 | 0.0
Recurring basis | Total fair value |  |
Assets: |  |
Total debt available-for-sale securities | 477.9 | 347.8
Marketable equity securities | 64.3 | 171.3
Money market funds | 283.1 | 274.4
Trading securities | 2.5 | 2.4
Foreign currency forward contracts | 4.0 | 0.0
Total assets | 831.8 | 795.9
Liability: |  |
Foreign currency forward contracts | 9.6 | 0.0
Total liabilities | 9.6 | 0.0
Recurring basis | Total fair value | U.S. treasuries |  |
Assets: |  |
Total debt available-for-sale securities | 67.5 | 46.1
Recurring basis | Total fair value | U.S. agencies |  |
Assets: |  |
Total debt available-for-sale securities | 36.4 | 24.9
Recurring basis | Total fair value | Municipal bonds and sovereign debt instruments |  |
Assets: |  |
Total debt available-for-sale securities | 3.5 | 2.0
Recurring basis | Total fair value | Asset-backed securities |  |
Assets: |  |
Total debt available-for-sale securities | 62.6 | 50.2
Recurring basis | Total fair value | Corporate securities |  |
Assets: |  |
Total debt available-for-sale securities | 301.9 | 224.6
Recurring basis | Total fair value | Certificates of deposits |  |
Assets: |  |
Total debt available-for-sale securities | $ 6.0 | $ 0.0

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