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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
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Weighted-average shares - basic (in shares) 232.5 231.9
Weighted-average shares - diluted (in shares) 232.5 231.9
Antidilutive share options excluded from computation of diluted earnings per share (in shares) 1.3 0.5