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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock-Based Compensation        
Restricted stock and restricted stock units $ 0.7 $ 1.6 $ 3.2 $ 6.0
Stock options, performance awards and other 0.1 0.3 0.6 1.1
Less: costs capitalized as part of inventory     (0.1) (0.4)
Expense included in selling, general and administrative and advanced technology costs 0.8 1.9 3.7 6.7
Total recognized tax benefit   $ 1.2   $ 4.3