Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Depositary Shares, each representing one-hundredth of a share of 5.200% Series F Preferred Stock, $0.01 par value Series F Preferred Stock [Member] Entity Address, City or Town Entity Address, City or Town Entities [Table] Entities [Table] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Security Exchange Name Security Exchange Name City Area Code City Area Code Cover [Abstract] Cover [Abstract] Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Entity Central Index Key Entity Central Index Key Document Type Document Type Entity Emerging Growth Company Entity Emerging Growth Company Title of 12(b) Security Title of 12(b) Security Common Stock, $0.01 par value Common Stock [Member] Entity Address, State or Province Entity Address, State or Province Amendment Flag Amendment Flag Class of Stock [Domain] Class of Stock [Domain] Trading Symbol Trading Symbol Document Period End Date Document Period End Date Class of Stock [Axis] Class of Stock [Axis] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Written Communications Written Communications Pre-commencement Tender Offer Pre-commencement Tender Offer Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer