Income Taxes - Schedule of Common Stock Distribution (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable [Line Items]
Dividends (in dollars per share)	$ 1.4800	$ 1.4800	$ 1.4800
Qualified business income for purpose of Code Section 199A (in dollars per share)	0.7139	0.7633	0.9414
Qualified dividend income for purposes of Code Section 1(h)(11) (in dollars per share)			0.0164
Ordinary dividends
Dividends Payable [Line Items]
Dividends (in dollars per share)	0.7139	0.7633	0.9578
Capital Gain Dividends
Dividends Payable [Line Items]
Dividends (in dollars per share)	0.5298	0.2714	0.5222
Nondividend distributions
Dividends Payable [Line Items]
Dividends (in dollars per share)	$ 0.2363	$ 0.4453	$ 0