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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dividends Declared (Details) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 25, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |  |  |
Dividends declared on common stock (in dollars per share) |  | $ 2.05 | $ 1.93 | $ 1.735
Common Stock | Subsequent Event |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends declared on common stock (in dollars per share) | $ 0.535 |  |  |

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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