Acquired Developed Technology and Other Intangibles (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Jan. 02, 2021	Dec. 28, 2019	Jun. 27, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 685.8		$ 685.8		$ 667.5
Accumulated Amortization	(565.0)		(565.0)		(519.4)
Net	120.8		120.8		148.1
Cost of revenues	8.4	$ 8.4	16.6	$ 16.8
Operating expenses	8.1	8.8	16.6	17.5
Total amortization of intangible assets	16.5	$ 17.2	33.2	$ 34.3
Estimated future amortization expense
Remainder of 2021	32.9		32.9
2021	39.5		39.5
2022	25.4		25.4
2023	10.3		10.3
2024	5.7		5.7
Thereafter	7.0		7.0
Total amortization	120.8		120.8
Acquired developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	447.8		447.8		437.1
Accumulated Amortization	(364.9)		(364.9)		(341.6)
Net	82.9		82.9		95.5
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	200.4		200.4		194.7
Accumulated Amortization	(172.1)		(172.1)		(154.1)
Net	28.3		28.3		40.6
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37.6		37.6		35.7
Accumulated Amortization	(28.0)		(28.0)		(23.7)
Net	$ 9.6		$ 9.6		$ 12.0