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Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc.
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc. Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc.
The computation of shares used in calculating basic and diluted net income per share is as follows:
 Three Months Ended
March 31,
(In millions)20212020
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - basic
668.6 678.1 
Common stock equivalents11.3 13.1 
Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share - diluted
679.9 691.2 
For the three months ended March 31, 2021 and 2020, stock options for 1.4 million and 1.0 million shares, respectively, were excluded from the calculation of weighted-average outstanding shares - diluted because their impact was anti-dilutive.