Stock Transactions And Stock-Based Compensation (Summary of Share Activity) (Details) - shares shares in Millions	3 Months Ended	9 Months Ended
Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	3.4	3.4	3.4	1.7
Issuance of stock	0.0	0.0	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	854.4	849.5	851.3	835.5
Issuance of stock	0.0	0.0	0.0	10.9
Common stock-based compensation awards	0.8	1.1	3.0	3.9
Common stock issued in connection with LYONs’ conversions	0.0	0.0	0.9	0.3
Balance, end of period	855.2	850.6	855.2	850.6

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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