Y Alleghany

Document and Entity Information

Document and Entity InformationMar. 01, 2021
Cover [Abstract]
Entity Registrant NameALLEGHANY CORP /DE
Amendment Flagfalse
Entity Central Index Key0000775368
Document Type8-K
Document Period End DateMar. 1,
Entity Incorporation State Country CodeDE
Entity File Number1-9371
Entity Tax Identification Number51-0283071
Entity Address, Address Line One1411 Broadway
Entity Address, Address Line Two34th Floor
Entity Address, City or TownNew York
Entity Address, State or ProvinceNY
Entity Address, Postal Zip Code10018
City Area Code(212)
Local Phone Number752-1356
Written Communicationsfalse
Soliciting Materialfalse
Pre Commencement Tender Offerfalse
Pre Commencement Issuer Tender Offerfalse
Security 12b TitleCommon Stock, $1.00 par value
Trading SymbolY
Security Exchange NameNYSE
Entity Emerging Growth Companyfalse