Income Taxes (Significant Components of the Company's Net Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Postretirement benefit obligation	$ 6.2	$ 5.9
Inventory	13.7us-gaap_DeferredTaxAssetsInventory	13.2us-gaap_DeferredTaxAssetsInventory
Net operating loss and credit carryforwards	6.3	3.8
Goodwill	1.0	0.5
Warranty reserve	2.5	2.1
Compensation	6.0	4.3
Other	11.5us-gaap_DeferredTaxAssetsOther	10.7us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	47.2us-gaap_DeferredTaxAssetsGross	40.5us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:
Depreciation and amortization	13.2	11.7
Pension	23.3pkoh_DeferredTaxLiabilitiesPension	26.4pkoh_DeferredTaxLiabilitiesPension
Goodwill	2.7	2.7
Intangible assets	14.5	15.4
Other	1.4us-gaap_DeferredTaxLiabilitiesOther	1.8us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	55.1us-gaap_DeferredIncomeTaxLiabilities	58.0us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities prior to valuation allowances	(7.9)	(17.5)
Valuation allowances	(7.1)	(2.6)
Net deferred tax liability	$ (15.0)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (20.1)us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Liabilities, Pension

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Deferred Tax Liability, Net of Deferred Tax Asset

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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