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Disposition of Non-Core Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Dec. 31, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Assets held for sale     $ 4.3 $ 4.3
TimkenSteel (Shanghai) Corporation Limited | Daido Steel (Shanghai) Co., Ltd.        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Proceeds from sale of consolidated subsidiary, net $ 6.2      
Loss on sale of consolidated subsidiary $ (1.1)      
Harrison Facility | Melt and Cast Related Assets        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Non-cash charges related to write down of assets   $ 9.5    
Machinery and Equipment | Harrison Facility | Melt and Cast Related Assets        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Non-cash charges related to write down of assets   7.9    
Spare Parts | Harrison Facility | Melt and Cast Related Assets        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Non-cash charges related to write down of assets   1.6    
Disposal Group, Held-for-sale, Not Discontinued Operation        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Impairment charges   0.3    
Assets held for sale     $ 4.3 $ 4.3
Disposal Group, Held-for-sale, Not Discontinued Operation | Machinery and Equipment        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Accelerated depreciation   1.5    
Disposal Group, Held-for-sale, Not Discontinued Operation | Spare Parts        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Impairment charges related to the indefinite idling of assets   $ 0.5