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Earnings Per Share (Reconciliation Of Weighted-Average Shares Used In Earnings Per Share Computations) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Weighted-average shares - basic (in shares) 232.4 231.8 232.2 231.5
Potentially dilutive share options (in shares) 0.1 0.2 0.0 0.2
Weighted-average shares - diluted (in shares) 232.5 232.0 232.2 231.7
Antidilutive share options excluded from computation of diluted earnings per share (in shares) 0.9 0.1 0.9 0.2