Condensed Consolidated Statements of Equity (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 29, 2018
Statement of Stockholders' Equity [Abstract]
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201802Member
Cash dividends per share (in dollars per share)	$ 1.08	$ 0.95	$ 3.24	$ 2.85
Share repurchases (in shares)	300,000	400,000	649,000	1,060,000
Treasury Stock, Value, Acquired, Cost Method	$ (45.1)	$ (59.7)	$ (95.6)	$ (167.2)