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DIVIDENDS AND DISTRIBUTIONS - Schedule of Dividend Reinvestment Plan Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Shares issued	1.5	1.9	0.0
Average issue price per share (in dollars per share)	$ 19.58	$ 19.86	$ 0
Shares purchased by plan agent to satisfy dividends declared and payable during the period for stockholders	$ 1.6	$ 0.0	$ 2.6
Average purchase price per share (in dollars per share)	$ 17.85	$ 0	$ 13.76

X

- Definition

Shares Purchased, Price Per Share

+ References

No definition available.

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X

- Definition

Stock Issued During Period, Shares Purchased To Satisfy Dividends

+ References

No definition available.

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Namespace Prefix:	arcc_
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Balance Type:	debit
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- References

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Namespace Prefix:	us-gaap_
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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644

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