Accounting Policies (Earnings Per Share Reconciliation) (Details) - shares shares in Millions	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Accounting Policies [Abstract]
Shares excluded from the calculation of the effect of dilutive securities									0.4	0.6	0.5
Denominator for Basic Earnings Per Share	40.9	41.5	42.6	42.8	43.1	43.4	43.8	44.2	42.0	43.6	44.6
Effect of Dilutive Securities									0.2	0.3	0.3
Denominator for Diluted Earnings Per Share	41.1	41.7	43.0	43.1	43.4	43.8	44.1	44.5	42.2	43.9	44.9