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Component: (Network and Table)
Network
2415402 - Disclosure - Income Taxes Income by Region (Details)
(http://www.atimetals.com/role/IncomeTaxesIncomeByRegionDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001018963 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Income (Loss) from Continuing Operations before Income Taxes, Domestic
(782,100,000) 
(534,600,000) 
(46,100,000) 
Income (Loss) from Continuing Operations before Income Taxes, Foreign
48,100,000  
56,600,000  
47,600,000  
Income (loss) from continuing operations before income taxes
(734,000,000) 
 
(478,000,000) 
 
1,500,000