Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Jul. 31, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Trading Symbol	TMST
Title of 12(b) Security	Common shares
Security Exchange Name	NYSE
Entity Registrant Name	TIMKENSTEEL CORPORATION
Entity Central Index Key	0001598428
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		46,224,853
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	OH
Entity Address, Address Line One	1835 Dueber Avenue SW
Entity Address, City or Town	Canton
Entity Address, State or Province	OH
City Area Code	330
Local Phone Number	471.7000
Entity Address, Postal Zip Code	44706
Entity Tax Identification Number	46-4024951
Entity File Number	1-36313