Investments (Summary of Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jul. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Short-term	$ 526.2	$ 460.4
Long-term	110.1	558.6
Total	636.3	1,019.0
Available-for-sale Investments
Schedule of Available-for-sale Securities [Line Items]
Short-term	523.7	459.4
Long-term	110.1	98.1
Total	633.8	557.5
Available-for-sale Investments | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Short-term	85.8	54.8
Long-term	0.0	0.0
Total	85.8	54.8
Available-for-sale Investments | Government securities - U.S.
Schedule of Available-for-sale Securities [Line Items]
Short-term	180.5	131.7
Long-term	0.0	0.0
Total	180.5	131.7
Available-for-sale Investments | Corporate debt securities - U.S.
Schedule of Available-for-sale Securities [Line Items]
Short-term	142.8	161.4
Long-term	68.4	64.2
Total	211.2	225.6
Available-for-sale Investments | Corporate debt securities - non U.S.
Schedule of Available-for-sale Securities [Line Items]
Short-term	114.6	111.5
Long-term	41.7	33.9
Total	156.3	145.4
Other | Time deposits
Schedule of Available-for-sale Securities [Line Items]
Short-term	0.6	0.6
Long-term	0.0	0.0
Total	0.6	0.6
Other | Other
Schedule of Available-for-sale Securities [Line Items]
Short-term	1.9	0.4
Long-term	0.0	460.5
Total	$ 1.9	$ 460.9