XML 13 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information Document
12 Months Ended
Dec. 31, 2014
Document Information [Line Items]  
Entity Registrant Name TimkenSteel Corporation
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 31, 2014
Entity Central Index Key 0001598428