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Income Taxes - Tax Status of Dividends (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Tax Status of Dividends [Line Items] |  |  |
Dividend per share | $ 2.38 | $ 2.34 | $ 2.22
Ordinary income | 100.00% | 97.00% | 98.00%
Capital gain | 0.00% | 3.00% | 0.00%
Allocation of Dividends, Qualified Dividend Income | 0.00% | 0.00% | 2.00%
Allocation of Dividends, Section 199A Dividend | 100.00% | 97.00% | 98.00%
Parent Company [Member] |  |  |
Schedule of Tax Status of Dividends [Line Items] |  |  |
Dividend per share | $ 2.19 | $ 2.34 | $ 2.22

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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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