Summary of Significant Accounting Policies - Common Stock Distributions (Details) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax status of common stock distributions deemed paid during the year:
Ordinary income (usd per share)	$ 1.234	$ 1.241	$ 1.069
Long-term capital gains (usd per share)	0.006	0	0
Non-dividend distributions (usd per share)	0.057	0	0
Distributions declared per common stock outstanding (usd per share)	$ 1.297	$ 1.241	$ 1.069

Represents the portion of common stock dividends declared or paid during the period that are taxable as ordinary income.

No definition available.

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Period Type:	duration