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Tax Treatment of Distributions - Dividends (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Dividends declared per common share (in dollars per share) | $ 1.97 | $ 1.91 | $ 1.79
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per common share (in dollars per share) | 1.970 | 1.910 | 1.790
Less: Dividends declared in the current year and paid in the following year (in dollars per share) | (0.500) | (0.485) | (0.455)
Add: Dividends declared in the prior year and paid in the current year (in dollars per share) | 0.485 | 0.455 | 0.425
Dividends paid per common share (in dollars per share) | $ 1.955 | $ 1.880 | $ 1.760

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