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DIVIDENDS AND DISTRIBUTIONS - Schedule of Dividend Reinvestment Plan Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity [Abstract]
Shares issued (in shares)	1.0	0.0
Average issue price per share (in dollars per share)	$ 20.82	$ 0
Shares purchased by plan agent to satisfy dividends declared and payable during the period for stockholders (in shares)	$ 0.0	$ 0.8
Average purchase price per share (in dollars per share)	$ 0	$ 18.35

X

- Definition

Shares Purchased, Price Per Share

+ References

No definition available.

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- Definition

Stock Issued During Period, Shares Purchased To Satisfy Dividends

+ References

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Namespace Prefix:	arcc_
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Balance Type:	debit
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- References

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- Definition

Per share or per unit amount of equity securities issued.

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No definition available.

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X

- Definition

Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481004/946-505-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(4)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3

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