Rendering

Component: (Network and Table)
Network
2407403 - Disclosure - Asset Retirement Obligations - Change in Asset Retirement Obligations (Details)
(http://www.atimetals.com/role/AssetRetirementObligationsChangeInAssetRetirementObligationsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001018963 (http://www.sec.gov/CIK)
Asset Retirement Obligation Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Asset Retirement Obligation Disclosure [Abstract]
 
 
Balance at beginning of year
25,000,000  
25,400,000  
Accretion expense
700,000  
600,000  
Payments
(2,000,000) 
(800,000) 
Revision of estimates
(400,000) 
(200,000) 
Balance at end of year
23,300,000  
 
25,000,000