Shareholders' Equity (Schedule Of Dividends Paid) (Details) - USD ($) $ / shares in Units, $ in Millions													12 Months Ended
	Dec. 29, 2016	Sep. 29, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Oct. 01, 2015	Jul. 02, 2015	Apr. 02, 2015	Jan. 02, 2015	Oct. 02, 2014	Jul. 02, 2014	Apr. 03, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Dividends, Common Stock [Abstract]
Dividends paid per common share													$ 1.04	$ 1.23	$ 0.784
Common shares
Dividends, Common Stock [Abstract]
Dividends paid per common share	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.1666666667
Payment of quarterly dividends	$ 22.6	$ 22.6	$ 22.8	$ 23.4	$ 23.7	$ 23.6	$ 23.6	$ 21.5	$ 21.7	$ 21.7	$ 21.9	$ 16.5