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Income Taxes (Components Of Deferred Tax Liabilities And Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Tax over book depreciation $ (76.9)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ (87.1)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Goodwill and Intangible Assets (135.2)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (132.4)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Other, net (9.1)us-gaap_DeferredTaxLiabilitiesOther (13.6)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross (221.2)us-gaap_DeferredIncomeTaxLiabilities (233.1)us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Pension and other post-retirement benefits 39.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 20.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Employment costs 47.2us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 36.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Environmental 46.5pol_DeferredTaxAssetsEnvironmental 49.3pol_DeferredTaxAssetsEnvironmental
Net operating loss carryforwards 42.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 38.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other, net 30.6us-gaap_DeferredTaxAssetsOther 32.6us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 205.4us-gaap_DeferredTaxAssetsGross 177.3us-gaap_DeferredTaxAssetsGross
Valuation allowances (23.6)us-gaap_DeferredTaxAssetsValuationAllowance (29.3)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax liabilities $ (39.4)us-gaap_DeferredTaxLiabilities $ (85.1)us-gaap_DeferredTaxLiabilities