Stockholders' Equity Tax Treatment of Dividends Paid (Details) - $ / shares		3 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 17.1875	$ 17.1875	$ 17.1875	$ 17.1875	$ 17.1875
Common Stock, Dividends, Per Share, Cash Paid		$ 1.20	$ 1.125	$ 1.125	$ 1.125
Preferred Stock [Member]
Class of Stock [Line Items]
Payment Date		Feb. 03, 2020	Nov. 01, 2019	Aug. 01, 2019	May 01, 2019	Feb. 01, 2019
Common Stock [Member]
Class of Stock [Line Items]
Payment Date		Dec. 31, 2019	Sep. 30, 2019	Jun. 28, 2019	Mar. 29, 2019
Common Stock [Member]
Class of Stock [Line Items]
Non-Taxable Distribution		$ 0.321	$ 0.301	$ 0.301	$ 0.301
Ordinary Taxable Dividend Per Share [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid		17.1875	17.1875	17.1875	17.1875
Common Stock, Dividends, Per Share, Cash Paid		0.879	0.824	0.824	0.824
Qualified Taxable Dividend Per Share [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	[1]	0.1490	0.1490	0.1490	0.1490
Common Stock, Dividends, Per Share, Cash Paid	[1]	0.008	0.007	0.007	0.007
Long-Term Capital Gain Distribution Per Share [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid		17.0385	17.0385	17.0385	17.0385
Common Stock, Dividends, Per Share, Cash Paid		$ 0.871	$ 0.817	$ 0.817	$ 0.817

[1] Qualified taxable dividend and section 199A dividend amounts are included in ordinary taxable dividend amounts.