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Business Combinations (Allocation Of Purchase Price) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 13, 2014
Business Acquisition [Line Items]        
Goodwill $ 590.6us-gaap_Goodwill $ 559.0us-gaap_Goodwill $ 405.5us-gaap_Goodwill  
Spartech Corporation        
Business Acquisition [Line Items]        
Accounts receivable       139.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Inventories       114.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Other current assets       18.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Property       280.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Other non-current assets       19.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Intangible assets       44.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Goodwill       162.6us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Total assets acquired       779.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Short-term and current portion of long-term debt       0.5pol_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesShorttermandLongtermDebt
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Accounts payable       105.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Accrued expenses and other liabilities       43.1pol_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Long-term debt       11.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Other non-current liabilities       109.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Total liabilities assumed       268.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember
Net assets acquired       $ 511.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= pol_SpartechCorporationMember