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Network
2411404 - Disclosure - Stock-Based Compensation Fair Value Assumptions (Details)
(http://www.aleris.com/role/StockBasedCompensationFairValueAssumptionsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001518587 (http://www.sec.gov/CIK)
Share-based Compensation [Abstract]Period [Axis]
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Share-based Compensation [Abstract]
 
 
Significant Assumptions Used to Determine Fair Value of Stock Options
 
 
Weighted average expected option life in years
P6Y  
P6Y  
Weighted average grant date fair value
10.54  
14.29  
Risk-free interest rate, minimum
1.50%  
 
Risk-free interest rate, maximum
1.60%  
 
Risk-free interest rate
 
2.00%  
Equity volatility factor, minimum
45.00%  
 
Equity volatility factor, maximum
50.00%  
 
Equity volatility factor
 
55.00%  
Dividend yield
0.00%  
0.00%  
Intrinsic value of options exercised
4,400,000  
100,000