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Income Taxes - Schedule of Common Stock Distribution (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Dividends Payable [Line Items] |  |  |  |
Qualified dividend income for purposes of Code Section 1(h)(11) | $ 0.0164 |  |  |
Qualified business income for purpose of Code Section 199A | 0.9414 |  |  |
Common dividends, per share (in dollars per share) | 1.48 | $ 1.480 | $ 2.095 |
Dividends, amount per share | 1.48 | 1.48 | 8.265 |
Spinoff | Spinoff |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share |  |  | 6.17 |
Ordinary dividends |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | 0.9578 | 1.48 | 1.5561 |
Capital gains |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | 0.5222 | 0 | 0 |
Nondividend distributions |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share | $ 0 | $ 0 | $ 6.7089 |
Nondividend distributions | Spinoff |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividends, amount per share |  |  |  | $ 6.17

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