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Stockholders' Equity (Reconciliation Of Denominators Used In Computation Of Basic And Diluted Earnings Per Share) (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stockholders' Equity Note [Abstract]      
Basic weighted average shares outstanding (in shares) 573,778,761 573,202,152 573,933,834
Weighted shares assumed upon exercise of stock options (in shares) 1,893,193 1,239,476 391,694
Diluted weighted average shares outstanding (in shares) 575,671,954 574,441,628 574,325,528