Cover - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 26, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-03134
Entity Registrant Name	PARK-OHIO HOLDINGS CORP.
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-1867219
Entity Address, Address Line One	6065 Parkland Boulevard,
Entity Address, City or Town	Cleveland,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44124
City Area Code	440
Local Phone Number	947-2000
Title of 12(b) Security	Common Stock, Par Value $1.00 Per Share
Trading Symbol	PKOH
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 227,923,175
Entity Common Stock, Shares Outstanding		12,579,619
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for the Annual Meeting of Shareholders to be held on or about May 27, 2021 are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0000076282
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY