Stockholder's Equity (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended				6 Months Ended
	Jan. 30, 2019	Mar. 27, 2020	Dec. 27, 2019	Mar. 29, 2019	Dec. 28, 2018	Mar. 27, 2020
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorized date	Jan. 30, 2019
Authorized amount of stock for repurchase	$ 2,000.0
Stock repurchase program expiration date	Jan. 30, 2021
Stock repurchased		$ 283.8	$ 74.2	$ 141.5	$ 284.0	$ 358.0
Treasury Stock, Shares, Acquired		3.2				4.0
Average price of stock repurchased (in dollars per share)		$ 87.61				$ 89.92
Remaining amount authorized fro stock repurchase		$ 1,300.0				$ 1,300.0