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Preferred Stock, Quarterly Dividend Rate, Per-Dollar-Amount

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The amount per share used to calculated dividend payments on preferred stock.

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The percentage rate used to calculate dividend payments on preferred stock.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan.

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-Name Accounting Standards Codification
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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stockholders' Equity (Schedule of Stock by Class) (Details) - USD ($) $ in Millions							3 Months Ended		6 Months Ended		12 Months Ended	87 Months Ended	93 Months Ended
	Feb. 26, 2020	Jan. 09, 2020	Oct. 30, 2019	Apr. 30, 2019	Mar. 01, 2018	Feb. 17, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2019	Jun. 30, 2020	May 31, 2020
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)							92,398,190		92,398,190		92,356,664	92,356,664	92,398,190
Common stock dividends (in usd per share)					$ 0.85		$ 0.85	$ 0.21	$ 0.85	$ 0.42
Preferred stock, shares authorized (in shares)							1,610,000		1,610,000		1,610,000	1,610,000	1,610,000
Preferred stock, shares issued (in shares)							1,610,000		1,610,000		1,610,000	1,610,000	1,610,000
Preferred stock, shares outstanding (in shares)							1,610,000		1,610,000		1,610,000	1,610,000	1,610,000
Preferred stock, dividend rate (in usd per share)									$ 1.84375
Preferred stock, quarterly dividend rate (in usd per share)									0.460938
Preferred stock, dividend rate, percentage									7.375%		7.375%
Preferred stock, liquidation preference (in usd per share)							$ 25.00		$ 25.00				$ 25.00
Per share price (in usd per share)	$ 17.50		$ 17.50	$ 20.25					$ 17.50			$ 20.95	$ 20.59
Number of shares repurchased (in shares)	505,101		446,830	656,433					505,101			4,391,519	4,896,620
Stock repurchase, value	$ 8.8	$ 1.7	$ 7.8	$ 13.3
DRIP period of notice to alter agreement						10 days
Common stock issued through distribution reinvestment plan (in shares)									700,000
Common stock issued through distribution reinvestment plan									$ 12.6
Tender Offer
Class of Stock [Line Items]
Shares authorized for repurchase (in shares)		200,000
Per share price (in usd per share)		$ 8.50
Number of shares repurchased (in shares)		200,000
Maximum
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)											50,000,000	50,000,000
Public Stock Offering
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)											1,610,000	1,610,000
Stockholder Rights
Class of Stock [Line Items]
Number or rights per share (in shares)														1