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Summary Of Significant Accounting Policies of Tax Treatment of Common Dividends Per Share for Federal Tax Purposes (Details) - $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Oct. 31, 2023 | Jul. 31, 2023 | Apr. 28, 2023 | Jan. 30, 2023 | Oct. 31, 2022 | Jul. 29, 2022 | Apr. 29, 2022 | Jan. 28, 2022 | Oct. 29, 2021 | Jul. 30, 2021 | Apr. 30, 2021 | Jan. 28, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 18, 2023
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends treatment for federal tax purposes. |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.16 | [1] | $ 3.95 | [2] | $ 3.92 | [3] |
Dividends Treatment For Federal Tax Purposes, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |  | 100.00% |  |
Distributions Payable, Amount Per Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.98
Dividends, Per Unit, Cash Paid | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 | $ 0.98 |  |  |  |  |  |  |  |  |
Ordinary income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends treatment for federal tax purposes. |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.04 |  | $ 3.42 |  | $ 2.90 |  |
Dividends Treatment For Federal Tax Purposes, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.98% |  | 86.60% |  | 73.86% |  |
Capital Gain Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends treatment for federal tax purposes. |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.12 |  | $ 0.53 |  | $ 0.57 |  |
Dividends Treatment For Federal Tax Purposes, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.02% |  | 13.40% |  | 14.57% |  |
Return of Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends treatment for federal tax purposes. |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0.45 |  |
Dividends Treatment For Federal Tax Purposes, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 0.00% |  | 11.57% |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions Payable, Amount Per Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.98 |  |  |  |  |  |
Dividend Declared | Tax Year 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions Payable, Amount Per Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.27 |  |  |  |  |  |
Dividend Declared | Tax Year 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions Payable, Amount Per Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.71 |  |  |  |  |  |
Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Per Unit, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.98 | $ 0.98 |  |  |  |  |  |  |
Dividend Paid [Member] | Tax Year 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Per Unit, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  | 0.95 |  |  |  |  |  |  |  |
Dividend Paid [Member] | Tax Year 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Per Unit, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.03 |  |  |  |  |  |  |  |
[1] | The fourth quarter 2023 regular quarterly dividend was $0.98 per common share, of which approximately $0.27 per common share was allocable to 2023 and approximately $0.71 per common share was allocable to 2024.
[2] | The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.
[3] | The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 + Details
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