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Earnings Per Common Share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Common Share Earnings Per Common Share
Diluted earnings per common share (“EPS”) attributable to IDEX is computed by dividing Net income attributable to IDEX by the weighted average number of common shares outstanding (basic) plus common stock equivalents outstanding (diluted) for the period. Common stock equivalents consist of restricted stock, performance share units and stock options, which have been included in the calculation of weighted average common shares outstanding using the treasury stock method.

ASC 260, Earnings Per Share (“ASC 260”), concludes that all outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends participate in undistributed earnings with common shareholders. If awards are considered participating securities, the Company is required to apply the two-class method of computing basic and diluted earnings per share. The Company has determined that its outstanding shares of restricted stock granted prior to the adoption of the 2024 Incentive Award Plan are participating securities. Accordingly, Diluted EPS attributable to IDEX was computed using the two-class method prescribed by ASC 260. Under the 2024 Incentive Award Plan, dividend rights for restricted stock are subject to the same vesting requirements as the underlying restricted stock awards. Consequently, any restricted stock awarded under the 2024 Incentive Plan will not be considered participating securities.

Basic weighted average common shares outstanding reconciles to diluted weighted average common shares outstanding as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
Basic weighted average common shares outstanding75.7 75.6 75.7 75.6 
Dilutive effect of restricted stock, performance share units and stock options0.2 0.3 0.2 0.3 
Diluted weighted average common shares outstanding75.9 75.9 75.9 75.9 

Share-based payment awards of approximately 0.5 million shares of common stock for both the three and nine months ended September 30, 2024 and 0.2 million shares of common stock for both the three and nine months ended September 30, 2023 were not included in the computation of Diluted EPS attributable to IDEX because the effect of their inclusion would have been antidilutive.