Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 30, 2017	Jul. 01, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	$ 422.4	$ 282.4
Certificates of deposit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	23.2	202.1
Commercial paper
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	35.3
Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	89.0	26.1
Corporate debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	262.5	46.4
Municipal bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	5.8	4.9
Mortgage-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	1.0	1.0
U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments		$ 1.9
Recurring basis
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets	491.3
Other accrued liabilities:
Derivative liability	39.5
Acquisition contingencies	2.7
Pension and post-retirement benefit accrual	4.3
Total other accrued liabilities	46.5
Recurring basis | Certificates of deposit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	23.2
Recurring basis | Commercial paper
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	35.3
Recurring basis | Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	89.0
Recurring basis | Corporate debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	262.5
Recurring basis | Municipal bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	5.8
Recurring basis | Mortgage-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	1.0
Recurring basis | U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	5.6
Recurring basis | Certificates of deposit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	6.2
Recurring basis | Commercial paper
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	41.9
Recurring basis | Corporate debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	2.7
Recurring basis | Money market funds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	3.0
Recurring basis | U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	13.5
Recurring basis | Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	1.6
Recurring basis | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets	16.5
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 | Certificates 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	0.0
Recurring basis | Level 1 | Certificates 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	3.0
Recurring basis | Level 1 | U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	13.5
Recurring basis | Level 1 | Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	0.0
Recurring basis | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets	474.8
Other accrued liabilities:
Derivative liability	0.0
Acquisition contingencies	0.0
Pension and post-retirement benefit accrual	4.3
Total other accrued liabilities	4.3
Recurring basis | Level 2 | Certificates of deposit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	23.2
Recurring basis | Level 2 | Commercial paper
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	35.3
Recurring basis | Level 2 | Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	89.0
Recurring basis | Level 2 | Corporate debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	262.5
Recurring basis | Level 2 | Municipal bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	5.8
Recurring basis | Level 2 | Mortgage-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	1.0
Recurring basis | Level 2 | U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Short-term investments	5.6
Recurring basis | Level 2 | Certificates of deposit
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	6.2
Recurring basis | Level 2 | Commercial paper
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	41.9
Recurring basis | Level 2 | Corporate debt securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	2.7
Recurring basis | Level 2 | Money market funds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	0.0
Recurring basis | Level 2 | U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	0.0
Recurring basis | Level 2 | Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	1.6
Recurring basis | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Total assets	0.0
Other accrued liabilities:
Derivative liability	39.5
Acquisition contingencies	2.7
Pension and post-retirement benefit accrual	0.0
Total other accrued liabilities	42.2
Recurring basis | Level 3 | Certificates 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 | Certificates 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 | U.S. Treasury
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	0.0
Recurring basis | Level 3 | Asset-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash equivalents	$ 0.0