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Network
2414405 - Disclosure - Commitments And Contingencies Environmental Liabilities (Details)
(http://www.aleris.com/role/CommitmentsAndContingenciesEnvironmentalLiabilitiesDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001518587 (http://www.sec.gov/CIK)
Commitments and Contingencies Disclosure [Abstract]Period [Axis]
2013-01-01 - 2013-12-31
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
Commitments and Contingencies Disclosure [Abstract]
 
 
 
Accrual for Environmental Loss Contingencies [Roll Forward]
 
 
 
Accrual for Environmental Loss Contingencies
34,200,000  
36,500,000  
36,200,000  
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Estimates
1,100,000  
(1,800,000) 
700,000  
Accrual for Environmental Loss Contingencies, Payments
(1,700,000) 
(600,000) 
(200,000) 
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Currency Translation
1,700,000  
100,000  
(200,000) 
Accrual for Environmental Loss Contingencies
35,300,000  
 
34,200,000  
 
36,500,000