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Total Equity Equity III (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
EQUITY, JANUARY 1, $ 1,935.7us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 1,914.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total comprehensive income 42.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 68.6us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Stock-based compensation 3.7us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition 3.2us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Exercise of stock options   0.5us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Income tax windfall from stock-based awards, net 1.3us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet 4.9us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Repurchase/surrender of common shares (78.6)hubb_AcquisitionAndSurrenderOfCommonShares (18.1)hubb_AcquisitionAndSurrenderOfCommonShares
Issuance of shares related to directors’ deferred compensation 0.2us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity 0.5us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity
Dividends to noncontrolling interest (0.6)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders (0.4)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Cash dividends declared (32.5)us-gaap_DividendsCommonStock (29.6)us-gaap_DividendsCommonStock
EQUITY, MARCH 31, 1,871.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,944.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Hubbell Shareholders’ Equity    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
EQUITY, JANUARY 1, 1,927.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,906.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Total comprehensive income 41.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
67.5us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Stock-based compensation 3.7us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
3.2us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Exercise of stock options   0.5us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Income tax windfall from stock-based awards, net 1.3us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
4.9us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Repurchase/surrender of common shares (78.6)hubb_AcquisitionAndSurrenderOfCommonShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(18.1)hubb_AcquisitionAndSurrenderOfCommonShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Issuance of shares related to directors’ deferred compensation 0.2us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
0.5us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionStockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Cash dividends declared (32.5)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(29.6)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
EQUITY, MARCH 31, 1,862.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,935.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Noncontrolling interest    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
EQUITY, JANUARY 1, 8.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
8.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Total comprehensive income 1.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
1.1us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Dividends to noncontrolling interest (0.6)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(0.4)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
EQUITY, MARCH 31, $ 9.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 9.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember