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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]    
Deferred Tax Asset Cumulative Loss Position Term 3 years 3 years
Valuation allowances $ 7.1us-gaap_DeferredTaxAssetsValuationAllowance $ 2.6us-gaap_DeferredTaxAssetsValuationAllowance
Unrecognized tax benefits, if recognized, would affect the effective tax rate 5.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 4.7us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Net interest and penalties 0.3us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0.7us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Payment of interest and penalties accrued 1.7us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 1.4us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Undistributed earnings 90.2us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards for income tax purposes 16.4us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
 
Operating loss carryforward, subject to expiration 1.9pkoh_OperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
 
Valuation allowances 6.9us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
1.2us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Foreign Tax Authority | Minimum    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforward Expiration Year 2015  
Foreign Tax Authority | Maximum    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforward Expiration Year 2024  
Foreign Tax Authority | Capital Loss Carryforward    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Capital Loss Carryforwards 0.6us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember
 
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards for income tax purposes 2.9us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
Valuation allowance against state net operating loss carryforward $ 1.3us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
State and Local Jurisdiction | Minimum    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforward Expiration Year 2015  
State and Local Jurisdiction | Maximum    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforward Expiration Year 2033