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Earnings Per Share
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Earnings Per Share
Note 12. Earnings Per Share
The computation of basic and diluted earnings per share for the years ended December 31, 2023, 2022 and 2021 were as follows:
 For the Years Ended December 31,
Basic and Diluted Earnings Per Share202320222021
Numerator:
Net income attributable to APAM$222,289 $206,755 $336,516 
Less: Allocation to participating securities19,880 22,801 31,430 
Net income available to common stockholders$202,409 $183,954 $305,086 
Denominator:
Basic weighted average shares outstanding63,451,932 62,475,960 59,866,790 
Dilutive effect of nonparticipating equity awards34,547 22,549 14,249 
Diluted weighted average shares outstanding63,486,479 62,498,509 59,881,039 
Earnings per share - Basic$3.19 $2.94 $5.10 
Earnings per share - Diluted$3.19 $2.94 $5.09 
Allocation to participating securities in the table above primarily represents dividends paid to holders of unvested restricted share-based awards, which reduces net income available to common stockholders.
The Holdings limited partnership units are anti-dilutive primarily due to the impact of public company expenses. Unvested restricted share-based awards with non-forfeitable dividend rights during the vesting period are considered participating securities and are therefore anti-dilutive.
The following table summarizes the weighted-average shares outstanding that are excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive:
 For the Years Ended December 31,
Anti-Dilutive Weighted Average Shares Outstanding202320222021
Holdings limited partnership units11,505,766 12,022,633 14,167,538 
Unvested restricted share-based awards5,572,690 5,601,756 5,410,221 
Total17,078,456 17,624,389 19,577,759