XML 62 R50.htm IDEA: XBRL DOCUMENT v3.25.3

Stockholders' Equity - Dividends Declared (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Dividends Declared [Line Items]
Dividends paid (in dollars per share)	$ 0.73	$ 0.71	$ 2.75	$ 2.34
O2025Q2Dividends [Member]
Dividends Declared [Line Items]
Dividends declared (in dollars per share)	0.73
Dividends paid (in dollars per share)	0.73
S2025Q2Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)	0
Dividends paid (in dollars per share)	$ 0
O 2024 Q3 Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)		0.71
Dividends paid (in dollars per share)		0.71
S 2024 Q3 Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)		0
Dividends paid (in dollars per share)		$ 0
O 2025 A Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)			2.25
Dividends paid (in dollars per share)			2.25
S 2025 A Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)			0.50
Dividends paid (in dollars per share)			$ 0.50
O 2024 A Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)				2.00
Dividends paid (in dollars per share)				2.00
S 2024 A Dividends
Dividends Declared [Line Items]
Dividends declared (in dollars per share)				0.34
Dividends paid (in dollars per share)				$ 0.34

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DividendsAxis=apam_O2025Q3DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_S2025Q3DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_O2024Q3DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_S2024Q3DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_O2025ADividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_S2025ADividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_O2024ADividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DividendsAxis=apam_S2024ADividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: