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Stockholders' Equity (Schedule of Stockholders' Equity) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Dec. 29, 2018	Sep. 29, 2018	Dec. 28, 2019	Dec. 29, 2018	Jun. 30, 2019	Jul. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)		286.8			286.8
Beginning balance	$ 3,086.9	$ 3,513.4	$ 3,309.6	$ 3,244.6	$ 3,513.4	$ 3,244.6
Net income	298.8	20.0	254.8	122.3	$ 318.8	377.1
Other comprehensive income (loss)	11.0	(12.8)	(3.4)	(5.3)
Shares issued, pursuant to stock-based compensation arrangements, net of shares withheld for taxes	2.1	(14.5)	3.7	3.2
Share-based compensation	16.8	26.8	21.5	22.4
Repurchase of common stock		(300.0)
Dividends declared	$ (93.2)	(97.1)	(97.8)	(97.8)
Ending balance (shares)	276.0				276.0
Ending balance	$ 3,322.4	$ 3,086.9	$ 3,488.4	$ 3,309.6	$ 3,322.4	$ 3,488.4
Cash dividends declared per common share (USD per share)	$ 0.3375	$ 0.3375	$ 0.3375	$ 0.3375	$ 0.6750	$ 0.6750
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (shares)	275.9	286.8	289.8	288.0	286.8	288.0
Beginning balance	$ 2.8	$ 2.9	$ 2.9	$ 2.9	$ 2.9	$ 2.9
Shares issued, pursuant to stock-based compensation arrangements, net of shares withheld for taxes (shares)	0.1	1.0	0.2	1.8
Repurchase of common stock (in shares)		(11.9)
Repurchase of common stock		$ (0.1)
Ending balance (shares)	276.0	275.9	290.0	289.8	276.0	290.0
Ending balance	$ 2.8	$ 2.8	$ 2.9	$ 2.9	$ 2.8	$ 2.9
Additional Paid-in- Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,314.4	3,302.1	3,231.1	3,205.5	3,302.1	3,205.5
Shares issued, pursuant to stock-based compensation arrangements, net of shares withheld for taxes	2.1	(14.5)	3.7	3.2
Share-based compensation	16.8	26.8	21.5	22.4
Ending balance	3,333.3	3,314.4	3,256.3	3,231.1	3,333.3	3,256.3
Retained Earnings / (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(134.3)	291.6	163.7	119.0	291.6	119.0
Net income	298.8	20.0	254.8	122.3
Repurchase of common stock		(299.9)
Dividends declared	(93.2)	(97.1)	(97.8)	(97.8)
Ending balance	71.3	(134.3)	320.7	163.7	71.3	320.7
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(96.0)	(83.2)	(88.1)	(82.8)	(83.2)	(82.8)
Other comprehensive income (loss)	11.0	(12.8)	(3.4)	(5.3)
Ending balance	$ (85.0)	$ (96.0)	$ (91.5)	$ (88.1)	$ (85.0)	$ (91.5)
Accounting Standards Update 2016-16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment from adoption of new accounting standard							$ (48.9)	$ 20.2
Accounting Standards Update 2016-16 \| Retained Earnings / (Accumulated Deficit)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment from adoption of new accounting standard							$ (48.9)	$ 20.2