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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
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Mar. 31, 2023 | Mar. 31, 2022
Equity [Abstract] |  |
Shares issued (in shares) | 0.0 | 0.6
Average issue price per share (in dollars per share) | $ 0 | $ 20.95
Shares purchased by plan agent to satisfy dividends declared and payable during the period for stockholders (in shares) | $ 0.8 | $ 0.0
Average purchase price per share (in dollars per share) | $ 18.35 | $ 0

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- Definition Shares Purchased, Price Per Share + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Stock Issued During Period, Shares Purchased To Satisfy Dividends + References No definition available. + Details
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Namespace Prefix: | arcc_
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Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- 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 + Details
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Period Type: | duration