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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of options outstanding (in shares) 143,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 146,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Intrinsic value of options exercised $ 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 1.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 0.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Issuance of common stock awards 0us-gaap_ProceedsFromStockOptionsExercised 0.4us-gaap_ProceedsFromStockOptionsExercised 0.5us-gaap_ProceedsFromStockOptionsExercised
Stock options awarded (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Total fair value of restricted stock units vested 11.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 6.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 4.6us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Unrecognized compensation expense 9.8us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Total weighted average period 2 years 0 months 6 days    
Number of shares available for future grants 120,871us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Range One      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise prices for options outstanding, lower limit (in dollars per share) $ 14.12us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pkoh_RangeOneMember
   
Exercise prices for options outstanding, upper limit (in dollars per share) $ 15.61us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pkoh_RangeOneMember
   
Number of options outstanding (in shares) 108,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pkoh_RangeOneMember
   
Range Two      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise prices for options outstanding, lower limit (in dollars per share) $ 20.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pkoh_RangeTwoMember
   
Exercise prices for options outstanding, upper limit (in dollars per share) $ 24.92us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pkoh_RangeTwoMember
   
Number of options outstanding (in shares) 35,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pkoh_RangeTwoMember
   
Stock Options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Employee option to purchase common stock     0.5pkoh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Current market value discount rate     20.00%pkoh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodDiscountPercentageOnSharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Compensation expense     0.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted shares and performance shares      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense $ 5.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= pkoh_RestrictedStockandPerformanceSharesMember
$ 4.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= pkoh_RestrictedStockandPerformanceSharesMember
$ 2.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= pkoh_RestrictedStockandPerformanceSharesMember