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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Oct. 31, 2019	Oct. 18, 2019	Oct. 10, 2019	Sep. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Shares authorized (in shares)				600,000,000
Common stock, shares authorized (in shares)				400,000,000	400,000,000
Preferred stock, shares authorized (in shares)				200,000,000	200,000,000
Preferred stock, par value (in dollars per share)				$ 0.01	$ 0.01
Preferred stock, liquidation preference per share (in dollars per share)				25.00
Redemption price (in dollars per share)				$ 25.00
Subsequent Event
Subsequent Event [Line Items]
Shares authorized (in shares)			1,000,000,000
Common stock, shares authorized (in shares)			800,000,000
Preferred stock, shares authorized (in shares)			200,000,000
Subsequent Event | Series E Preferred Stock
Subsequent Event [Line Items]
Preferred stock, cumulative redeemable dividend rate	7.875%
Preferred stock, par value (in dollars per share)		$ 0.01
Subsequent Event | Underwritten Public Offering | Series E Preferred Stock
Subsequent Event [Line Items]
Preferred stock, cumulative redeemable dividend rate	7.875%
Preferred stock, liquidation preference per share (in dollars per share)	$ 25.00
Redemption price (in dollars per share)	$ 1.96875
Shares issued (in shares)	6,900,000
Proceeds from issuance of shares	$ 166.7
Subsequent Event | Underwritten Public Offering | Series E Preferred Stock | LIBOR
Subsequent Event [Line Items]
Preferred stock, liquidation preference per share (in dollars per share)	$ 25.00
Interest rate, basis spread	6.429%

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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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