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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method

			For the Three Months Ended September 30,												For the Nine Months Ended September 30,
Basic and Diluted Earnings Per Share			2021						2020						2021						2020
Numerator:
Net income attributable to APAM			$	86,413					$	58,527					$	251,898					$	139,503
Less: Allocation to participating securities			8,226						6,006						23,260						16,944
Net income available to common stockholders			$	78,187					$	52,521					$	228,638					$	122,559
Denominator:
Basic weighted average shares outstanding			59,965,549						56,402,503						59,519,634						55,188,563
Dilutive effect of nonparticipating share-based awards			17,225						5,769						16,260						1,923
Diluted weighted average shares outstanding			59,982,774						56,408,272						59,535,894						55,190,486
Earnings per share - Basic			$	1.30					$	0.93					$	3.84					$	2.22
Earnings per share - Diluted			$	1.30					$	0.93					$	3.84					$	2.22

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

			For the Three Months Ended September 30,												For the Nine Months Ended September 30,
Anti-Dilutive Weighted Average Shares Outstanding			2021						2020						2021						2020
Holdings limited partnership units			14,146,934						17,177,313						14,486,932						18,308,766
Unvested restricted share-based awards			5,417,353						5,389,854						5,438,556						5,323,596
Total			19,564,287						22,567,167						19,925,488						23,632,362

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

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Tabular disclosure of the effect of income (loss) on basic earnings per share.

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