Debt Instrument, Term Over Which Basis Spread on Variable Rate Reduces

No definition available.

Name:	pkoh_DebtInstrumentTermOverWhichBasisSpreadonVariableRateReduces
Namespace Prefix:	pkoh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Inventory Advance Rate

+ References

No definition available.

+ Details

Name:	pkoh_LineofCreditFacilityInventoryAdvanceRate
Namespace Prefix:	pkoh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Inventory Advance Rate to Be Reduced to on a Pro-Rata Quarterly Basis

+ References

No definition available.

+ Details

Name:	pkoh_LineofCreditFacilityInventoryAdvanceRatetoBeReducedtoonaProRataQuarterlyBasis
Namespace Prefix:	pkoh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Term Over Which Inventory Advance Rate Reduces

+ References

No definition available.

+ Details

Name:	pkoh_LineofCreditFacilityTermOverWhichInventoryAdvanceRateReduces
Namespace Prefix:	pkoh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_CapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pkoh_SouthwestSteelProcessingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=pkoh_ArkansasDevelopmentFinanceAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=pkoh_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=pkoh_AmendmentNumberOnetoSixthAmendedandRestatedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=pkoh_RevolvingCreditFacilityCanadianSubLimitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=pkoh_RevolvingCreditFacilityEuropeanSubLimitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=pkoh_SixthAmendedandRestatedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=pkoh_CanadianDepositOfferedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=pkoh_CanadianPrimeLendingRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financing Arrangements (Narrative) (Details) - USD ($)	Apr. 22, 2016	Sep. 30, 2016	Dec. 31, 2015	Oct. 21, 2015	Aug. 13, 2015	Oct. 23, 2014
Machinery and Equipment
Line of Credit Facility [Line Items]
Capital lease obligations		$ 17,000,000
Southwest Steel Processing LLC \| Arkansas Development Finance Authority
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 11,000,000.0
Amount drawn		5,500,000
Maximum
Line of Credit Facility [Line Items]
Capital lease obligations					$ 50,000,000
Revolving credit
Line of Credit Facility [Line Items]
Carrying amount		151,600,000	$ 169,000,000
Term Loan
Line of Credit Facility [Line Items]
Carrying amount		$ 24,500,000	$ 27,900,000
Amendment No. 1 to the Amended Credit Agreement \| Revolving credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 300,000,000.0
Inventory advance rate percentage to be reduced to	50.00%
Term over which inventory advance rate percentage reduces	36 months
Amount drawn	$ 35,000,000
Term over which basis spread on variable interest rate reduces	36 months
Amendment No. 1 to the Amended Credit Agreement \| Revolving credit \| LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	3.50%
Amendment No. 1 to the Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 35,000,000.0
Amendment No. 1 to the Amended Credit Agreement \| Revolving Credit Facility, European Sub-Limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	25,000,000.0
Amendment No. 1 to the Amended Credit Agreement \| Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 35,000,000.0
The Amended Credit Agreement \| Revolving credit
Line of Credit Facility [Line Items]
Inventory advance rate percentage	65.00%					50.00%
Term of debt instrument	7 years
The Amended Credit Agreement \| Revolving credit \| LIBOR \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	1.50%
The Amended Credit Agreement \| Revolving credit \| LIBOR \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	2.50%
The Amended Credit Agreement \| Revolving credit \| Prime lending rate \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	(0.25%)
The Amended Credit Agreement \| Revolving credit \| Prime lending rate \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	(1.25%)
The Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit \| Canadian deposit offered rate \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	1.50%
The Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit \| Canadian deposit offered rate \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	2.50%
The Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit \| Canadian prime lending rate \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	0.00%
The Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit \| Canadian prime lending rate \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	1.00%
The Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit \| US base rate \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	0.00%
The Amended Credit Agreement \| Revolving Credit Facility, Canadian Sub-Limit \| US base rate \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	1.00%
The Amended Credit Agreement \| Term Loan \| LIBOR \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	2.00%
The Amended Credit Agreement \| Term Loan \| LIBOR \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate - plus (minus)	3.00%