Weighted-Average Shares Used In Computing Earnings Per Common Share (Schedule Of Weighted-Average Shares Used In Computing Earnings Per Share) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Weighted-average common shares outstanding - basic (in shares)	88.9	93.0	89.1	93.7
Plus dilutive impact of share-based compensation (in shares)	0.9	1.3	0.8	1.2
Weighted-average common shares - diluted (in shares)	89.8	94.3	89.9	94.9