Goodwill (Change in Goodwill) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 89.5us-gaap_Goodwill	$ 60.4us-gaap_Goodwill
Acquisitions		28.9us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation	(2.5)us-gaap_GoodwillTranslationAdjustments	0.2us-gaap_GoodwillTranslationAdjustments
Acquisition adjustments	(0.1)
Goodwill, end of period	86.9us-gaap_Goodwill	89.5us-gaap_Goodwill
Supply Technologies [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	7.6	6.4
Acquisitions		0.7
Foreign currency translation	(0.4)	0.5
Acquisition adjustments	0
Goodwill, end of period	7.2	7.6
Assembly Components [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	54.0	49.0
Acquisitions		5.0
Foreign currency translation	0	0
Acquisition adjustments	(0.1)
Goodwill, end of period	53.9	54.0
Engineered Products [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	27.9	5.0
Acquisitions		23.2
Foreign currency translation	(2.1)	(0.3)
Acquisition adjustments	0
Goodwill, end of period	$ 25.8	$ 27.9

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

+ Details

Name:	us-gaap_GoodwillPurchaseAccountingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

Name:	us-gaap_GoodwillTranslationAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pkoh_AssemblyComponentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pkoh_EngineeredProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pkoh_SupplyTechnologiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: