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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jul. 01, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments $ 381.7 $ 282.4
Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 113.2 202.1
Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 23.5  
Asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 66.0 26.1
Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 170.9 46.4
Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 5.1 4.9
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 1.1 1.0
U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 1.9 $ 1.9
Recurring basis    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Total Assets 451.0  
Other accrued liabilities:    
Derivative liability 47.4  
Acquisition contingencies 2.7  
Pension and post-retirement benefit accrual 4.2  
Total other accrued liabilities 54.3  
Recurring basis | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 113.2  
Recurring basis | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 23.5  
Recurring basis | Asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 66.0  
Recurring basis | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 170.9  
Recurring basis | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 5.1  
Recurring basis | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 1.1  
Recurring basis | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 1.9  
Recurring basis | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 11.0  
Recurring basis | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 33.9  
Recurring basis | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 3.2  
Recurring basis | Money market funds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 1.3  
Recurring basis | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 1.0  
Recurring basis | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 18.9  
Recurring basis | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Total Assets 22.1  
Other accrued liabilities:    
Derivative liability 0.0  
Acquisition contingencies 0.0  
Pension and post-retirement benefit accrual 0.0  
Total other accrued liabilities 0.0  
Recurring basis | Level 1 | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 1 | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 1 | Asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 1 | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 1 | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 1 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 1 | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 1.9  
Recurring basis | Level 1 | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 1 | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 1 | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 1 | Money market funds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 1.3  
Recurring basis | Level 1 | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 1 | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 18.9  
Recurring basis | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Total Assets 428.9  
Other accrued liabilities:    
Derivative liability 0.0  
Acquisition contingencies 0.0  
Pension and post-retirement benefit accrual 4.2  
Total other accrued liabilities 4.2  
Recurring basis | Level 2 | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 113.2  
Recurring basis | Level 2 | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 23.5  
Recurring basis | Level 2 | Asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 66.0  
Recurring basis | Level 2 | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 170.9  
Recurring basis | Level 2 | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 5.1  
Recurring basis | Level 2 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 1.1  
Recurring basis | Level 2 | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 2 | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 11.0  
Recurring basis | Level 2 | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 33.9  
Recurring basis | Level 2 | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 3.2  
Recurring basis | Level 2 | Money market funds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 2 | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 1.0  
Recurring basis | Level 2 | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Total Assets 0.0  
Other accrued liabilities:    
Derivative liability 47.4  
Acquisition contingencies 2.7  
Pension and post-retirement benefit accrual 0.0  
Total other accrued liabilities 50.1  
Recurring basis | Level 3 | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | Asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Short-term investments 0.0  
Recurring basis | Level 3 | Certificate of deposit    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 3 | Commercial paper    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 3 | Corporate debt securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 3 | Money market funds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 3 | Municipal bonds    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents 0.0  
Recurring basis | Level 3 | U.S. Treasury    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash equivalents $ 0.0