Document Type Document Type Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Amendment Flag Amendment Flag City Area Code City Area Code Entity Address, State or Province Entity Address, State or Province Soliciting Material Soliciting Material Depositary shares Depositary shares [Member] Depositary shares representing a 1/20th interest in a share of 7.00% Series B Mandatory Convertible Preferred Stock. Document Period End Date Document Period End Date Entity Tax Identification Number Entity Tax Identification Number Pre-commencement Tender Offer Pre-commencement Tender Offer Entities [Table] Entities [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Exchange [Domain] Exchange [Domain] New York Stock Exchange New York Stock Exchange [Member] New York Stock Exchange [Member] Class of Stock [Domain] Class of Stock [Domain] Chicago Stock Exchange Chicago Stock Exchange [Member] Chicago Stock Exchange [Member] Class of Stock [Axis] Class of Stock [Axis] Entity File Number Entity File Number Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Entity Address, Postal Zip Code Entity Address, Postal Zip Code Local Phone Number Local Phone Number Written Communications Written Communications Title of 12(b) Security Title of 12(b) Security Security Exchange Name Security Exchange Name Entity Address, City or Town Entity Address, City or Town Cover [Abstract] Cover [Abstract] Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, Address Line One Entity Address, Address Line One Common Stock, $0.01 Par Value Common Stock, $0.01 Par Value [Member] Common Stock, $0.01 Par Value [Member] Entity Emerging Growth Company Entity Emerging Growth Company Entity Registrant Name Entity Registrant Name Entity Information [Line Items] Entity Information [Line Items]