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Investments, Forward Contracts and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jul. 01, 2017
Assets:    
Total debt available-for-sale securities $ 189.6 $ 509.1
Liability:    
Foreign currency forward contracts 11.7 1.3
U.S. treasuries    
Assets:    
Total debt available-for-sale securities 35.9 56.7
U.S. agencies    
Assets:    
Total debt available-for-sale securities 13.2 44.9
Municipal bonds and sovereign debt instruments    
Assets:    
Total debt available-for-sale securities 2.7 4.4
Asset-backed securities    
Assets:    
Total debt available-for-sale securities 23.5 71.1
Corporate securities    
Assets:    
Total debt available-for-sale securities 114.3 326.0
Certificate of deposits    
Assets:    
Total debt available-for-sale securities   6.0
Recurring basis    
Assets:    
Total debt available-for-sale securities 189.6 509.1
Marketable equity securities 0.0 0.0
Money market funds 354.9 726.4
Trading securities 1.6 2.0
Foreign currency forward contracts 2.7 7.3
Total assets 548.8 1,244.8
Liability:    
Foreign currency forward contracts 11.7 1.3
Total liabilities 11.7 1.3
Recurring basis | Cash and cash equivalents    
Assets:    
Total assets 364.8 789.2
Recurring basis | Short-term investments    
Assets:    
Total assets 169.3 432.2
Recurring basis | Restricted cash    
Assets:    
Total assets 7.3 11.0
Recurring basis | Other current assets    
Assets:    
Total assets 2.7 7.3
Recurring basis | Other non-current assets    
Assets:    
Total assets 4.7 5.1
Recurring basis | Other current liabilities    
Liability:    
Total liabilities 11.7 1.3
Recurring basis | U.S. treasuries    
Assets:    
Total debt available-for-sale securities 35.9 56.7
Recurring basis | U.S. agencies    
Assets:    
Total debt available-for-sale securities 13.2 44.9
Recurring basis | Municipal bonds and sovereign debt instruments    
Assets:    
Total debt available-for-sale securities 2.7 4.4
Recurring basis | Asset-backed securities    
Assets:    
Total debt available-for-sale securities 23.5 71.1
Recurring basis | Corporate securities    
Assets:    
Total debt available-for-sale securities 114.3 326.0
Recurring basis | Certificate of deposits    
Assets:    
Total debt available-for-sale securities 0.0 6.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total debt available-for-sale securities 35.9 56.7
Marketable equity securities 0.0 0.0
Money market funds 354.9 726.4
Trading securities 1.6 2.0
Foreign currency forward contracts 0.0 0.0
Total assets 392.4 785.1
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 35.9 56.7
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) | Certificate 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 153.7 452.4
Marketable equity securities 0.0 0.0
Money market funds 0.0 0.0
Trading securities 0.0 0.0
Foreign currency forward contracts 2.7 7.3
Total assets 156.4 459.7
Liability:    
Foreign currency forward contracts 11.7 1.3
Total liabilities 11.7 1.3
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 13.2 44.9
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments    
Assets:    
Total debt available-for-sale securities 2.7 4.4
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets:    
Total debt available-for-sale securities 23.5 71.1
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets:    
Total debt available-for-sale securities 114.3 326.0
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificate of deposits    
Assets:    
Total debt available-for-sale securities $ 0.0 $ 6.0