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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