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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 09, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 1-2958    
Entity Registrant Name HUBBELL INC    
Entity Incorporation, State or Country Code CT    
Entity Tax Identification Number 06-0397030    
Entity Address, Address Line One 40 Waterview Drive    
Entity Address, City or Town Shelton    
Entity Address, State or Province CT    
Entity Address, Postal Zip Code 06484    
City Area Code (475)    
Local Phone Number 882-4000    
Title of 12(b) Security Common Stock — par value $0.01 per share    
Trading Symbol HUBB    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 6,739,772,177
Entity Common Stock, Shares Outstanding   54,296,993  
Documents Incorporated by Reference
Portions of the definitive proxy statement for the annual meeting of shareholders scheduled to be held on May 4, 2021, to be filed with the Securities and Exchange Commission (the “SEC”), are incorporated by reference in answer to Part III of this Form 10-K.
*Calculated by excluding all shares held by Executive Officers and Directors of registrant without conceding that all such persons or entities are “affiliates” of registrant for purpose of the Federal Securities Laws.
    
Entity Central Index Key 0000048898    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false