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Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Inventory $ 4.6us-gaap_DeferredTaxAssetsInventory $ 4.7us-gaap_DeferredTaxAssetsInventory
Income tax credits 30.6us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 31.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Accrued liabilities 23.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 19.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Pension 43.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 23.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Post retirement and post employment benefits 11.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 11.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Stock-based compensation 11.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 10.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards 46.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 53.1us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Miscellaneous other 7.5us-gaap_DeferredTaxAssetsOther 3.4us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 178.6us-gaap_DeferredTaxAssetsGross 156.0us-gaap_DeferredTaxAssetsGross
Valuation allowance (34.3)us-gaap_DeferredTaxAssetsValuationAllowance (28.5)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets, net of valuation allowance 144.3us-gaap_DeferredTaxAssetsNet 127.5us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Acquisition basis difference (145.8)hubb_AcquisitionBasisDifference (123.3)hubb_AcquisitionBasisDifference
Property, plant, and equipment (41.9)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (40.4)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (187.7)us-gaap_DeferredIncomeTaxLiabilities (163.7)us-gaap_DeferredIncomeTaxLiabilities
TOTAL NET DEFERRED TAX LIABILITY (43.4)us-gaap_DeferredTaxAssetsLiabilitiesNet (36.2)us-gaap_DeferredTaxAssetsLiabilitiesNet
Current tax assets (included in Deferred taxes and other) 31.2us-gaap_DeferredTaxAssetsNetCurrent 31.0us-gaap_DeferredTaxAssetsNetCurrent
Non-current tax assets (included in Other long-term assets) 1.1us-gaap_DeferredTaxAssetsNetNoncurrent 1.0us-gaap_DeferredTaxAssetsNetNoncurrent
Current tax liabilities (included in Other accrued liabilities) (1.2)us-gaap_DeferredTaxLiabilitiesGrossCurrent (1.5)us-gaap_DeferredTaxLiabilitiesGrossCurrent
Non-current tax liabilities (included in Other Non-current liabilities) $ (74.5)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent $ (66.7)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent