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Subsequent Events (Cash Dividends Declared) (Details) - $ / shares |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 23, 2019 | Dec. 15, 2019 | Dec. 10, 2019 | Nov. 03, 2019 | Aug. 04, 2019 | May 05, 2019 | Feb. 03, 2019 | Nov. 04, 2018 | Aug. 05, 2018 | May 06, 2018 | Feb. 04, 2018 | Nov. 03, 2019 | Nov. 04, 2018
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  |  |  | $ 2.65 | $ 2.65 | $ 2.65 | $ 2.65 | $ 1.75 | $ 1.75 | $ 1.75 | $ 1.75 | $ 10.60 | $ 7.00
Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, Date declared |  |  |  | Dec. 10, 2019 |  |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) |  |  |  | $ 3.25 |  |  |  |  |  |  |  |  |  |
Dividends payable, Date to be paid | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, Date of record |  | Dec. 23, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, Date declared |  |  |  | Dec. 10, 2019 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared |  |  |  | $ 20.00 |  |  |  |  |  |  |  |  |  |
Dividends payable, Date to be paid | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, Date of record |  |  | Dec. 15, 2019 |  |  |  |  |  |  |  |  |  |  |

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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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