Stock Transactions And Stock-Based Compensation (Summary of Share Activity) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	3.4	1.7	3.4	1.7
Issuance of stock	0.0	1.7	0.0	1.7
Balance, end of period	3.4	3.4	3.4	3.4
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	853.7	837.3	851.3	835.5
Issuance of stock	0.0	10.9	0.0	10.9
Common stock-based compensation awards	0.7	1.0	2.2	2.8
Common stock issued in connection with LYONs’ conversions	0.0	0.3	0.9	0.3
Balance, end of period	854.4	849.5	854.4	849.5