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Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stockholders' Equity Note [Abstract]    
Basic weighted average shares outstanding (in shares) 574,336,112 573,904,156
Weighted shares assumed upon exercise of stock options (in shares) 2,210,857 1,414,674
Diluted weighted average shares outstanding (in shares) 576,546,969 575,318,830