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Tax Treatment of Distributions - Dividends (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Dividends declared per common share (in dollars per share) | $ 2.04 | $ 1.97 | $ 1.91
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Dividends declared per common share (in dollars per share) | 2.040 | 1.970 | 1.910
Less: Dividends declared in the current year and paid in the following year (in dollars per share) | (0.520) | (0.500) | (0.485)
Add: Dividends declared in the prior year and paid in the current year (in dollars per share) | 0.500 | 0.485 | 0.455
Dividends paid per common share (in dollars per share) | $ 2.020 | $ 1.955 | $ 1.880

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