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Earnings Per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Basic weighted average shares outstanding (shares) 286,922 288,286 295,262
Dilutive effect of stock options and restricted stock/RSUs (shares) [1] 991 2,550 3,898
Diluted weighted average shares outstanding (shares) 287,913 290,836 299,160
Stock Option      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive outstanding options excluded from computation of earnings per share (shares) 7,159 4,985 3,143
[1] *Excludes outstanding options to purchase shares of common stock that had exercise prices in excess of the average market price of our common stock during the year and, therefore, the effect of including these options would be antidilutive. These options totaled 7,159 in 2020, 4,985 in 2019 and 3,143 in 2018.