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Selected Quarterly Financial Data (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 03, 2013
Aug. 01, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Net sales   $ 373.0us-gaap_SalesRevenueNet $ 344.6us-gaap_SalesRevenueNet $ 343.3us-gaap_SalesRevenueNet $ 317.8us-gaap_SalesRevenueNet $ 309.4us-gaap_SalesRevenueNet $ 303.5us-gaap_SalesRevenueNet $ 307.3us-gaap_SalesRevenueNet $ 283.0us-gaap_SalesRevenueNet $ 1,378.7us-gaap_SalesRevenueNet $ 1,203.2us-gaap_SalesRevenueNet $ 1,128.2us-gaap_SalesRevenueNet    
Gross profit   56.9us-gaap_GrossProfit 60.6us-gaap_GrossProfit 61.0us-gaap_GrossProfit 56.0us-gaap_GrossProfit 47.3us-gaap_GrossProfit 54.6us-gaap_GrossProfit 57.5us-gaap_GrossProfit 51.6us-gaap_GrossProfit 234.5us-gaap_GrossProfit 211.0us-gaap_GrossProfit 207.3us-gaap_GrossProfit    
Net income from continuing operations   11.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 12.5us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 12.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 10.3us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 9.4us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 8.7us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 12.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 10.7us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 46.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 40.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 34.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest    
Income (loss) from discontinued operations, net of taxes           (0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 3.7us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (0.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (0.4)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 3.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (2.4)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax    
Net income attributable to noncontrolling interest   (0.5)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (0.1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (0.5)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (0.2)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (0.3)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (0.2)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (1.3)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (0.5)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest    
Net income attributable to ParkOhio common shareholders   10.7us-gaap_NetIncomeLoss 12.4us-gaap_NetIncomeLoss 12.4us-gaap_NetIncomeLoss 10.1us-gaap_NetIncomeLoss 8.9us-gaap_NetIncomeLoss 12.2us-gaap_NetIncomeLoss 12.0us-gaap_NetIncomeLoss 10.3us-gaap_NetIncomeLoss 45.6us-gaap_NetIncomeLoss 43.4us-gaap_NetIncomeLoss 31.8us-gaap_NetIncomeLoss    
Earnings (loss) per common share attributable to ParkOhio common shareholders - Basic:                            
Continuing operations (in dollars per share)   $ 0.89us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.02us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.02us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.84us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.76us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.71us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.02us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.90us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.77us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 3.40us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.87us-gaap_IncomeLossFromContinuingOperationsPerBasicShare    
Discontinued operations (in dollars per share)           $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.31us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.25us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare    
Total (in dollars per share)           $ 0.74us-gaap_EarningsPerShareBasic $ 1.02us-gaap_EarningsPerShareBasic $ 1.01us-gaap_EarningsPerShareBasic $ 0.87us-gaap_EarningsPerShareBasic $ 3.77us-gaap_EarningsPerShareBasic $ 3.65us-gaap_EarningsPerShareBasic $ 2.67us-gaap_EarningsPerShareBasic    
Cash dividends per common share (in dollars per share)   $ 0.125000us-gaap_CommonStockDividendsPerShareCashPaid $ 0.125000us-gaap_CommonStockDividendsPerShareCashPaid $ 0.125000us-gaap_CommonStockDividendsPerShareCashPaid $ 0us-gaap_CommonStockDividendsPerShareCashPaid         $ 0.375us-gaap_CommonStockDividendsPerShareCashPaid $ 0us-gaap_CommonStockDividendsPerShareCashPaid $ 0us-gaap_CommonStockDividendsPerShareCashPaid    
Earnings (loss) per common share attributable to ParkOhio common shareholders - Diluted:                            
Continuing operations (in dollars per share)   $ 0.87us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.00us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.00us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.82us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.76us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.69us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.99us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.88us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.68us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 3.31us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.82us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare    
Discontinued operations (in dollars per share)           $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.30us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.25us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare    
Total (in dollars per share)           $ 0.74us-gaap_EarningsPerShareDiluted $ 0.99us-gaap_EarningsPerShareDiluted $ 0.98us-gaap_EarningsPerShareDiluted $ 0.85us-gaap_EarningsPerShareDiluted $ 3.68us-gaap_EarningsPerShareDiluted $ 3.56us-gaap_EarningsPerShareDiluted $ 2.62us-gaap_EarningsPerShareDiluted    
Litigation judgment and settlement costs 5.2us-gaap_LitigationSettlementExpense                 0us-gaap_LitigationSettlementExpense 5.2us-gaap_LitigationSettlementExpense 13.0us-gaap_LitigationSettlementExpense    
Supply Technologies                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Net sales                   559.6us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= pkoh_SupplyTechnologiesMember		 471.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= pkoh_SupplyTechnologiesMember		 483.8us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= pkoh_SupplyTechnologiesMember		    
Discontinued Operations | Non-core Business Unit | Supply Technologies                            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                            
Income (loss) from discontinued operations, net of taxes                     3.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ pkoh_DisposalGroupClassificationAxis
= us-gaap_SegmentDiscontinuedOperationsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pkoh_NoncoreBusinessUnitMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkoh_SupplyTechnologiesMember		 (2.4)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ pkoh_DisposalGroupClassificationAxis
= us-gaap_SegmentDiscontinuedOperationsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pkoh_NoncoreBusinessUnitMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkoh_SupplyTechnologiesMember		    
Earnings (loss) per common share attributable to ParkOhio common shareholders - Diluted:                            
Proceeds from sale of non-core business unit                         $ 8.5us-gaap_ProceedsFromDivestitureOfBusinesses
/ pkoh_DisposalGroupClassificationAxis
= us-gaap_SegmentDiscontinuedOperationsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pkoh_NoncoreBusinessUnitMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkoh_SupplyTechnologiesMember		  
Southwest Steel Processing LLC                            
Earnings (loss) per common share attributable to ParkOhio common shareholders - Diluted:                            
Sale of noncontrolling interest                           25.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= pkoh_SouthwestSteelProcessingLLCMember