Weighted-Average Shares Used In Computing Earnings Per Share (Schedule Of Weighted-Average Shares Used In Computing Earnings Per Share) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Weighted-average shares - basic: (in shares)	87.8	92.3	95.5
Plus dilutive impact of share-based compensation (in shares)	0.9	1.2	1.0
Weighted-average shares - diluted: (in shares)	88.7	93.5	96.5