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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation [Abstract]        
Restricted stock and restricted stock units $ 0.4 $ 1.3 $ 1.3 $ 2.5
Stock options, performance awards and other 0 0.2 0.1 0.5
Less: costs capitalized as part of inventory   (0.1)   (0.1)
Expense included in selling, general and administrative and advanced technology costs $ 0.4 $ 1.4 $ 1.4 $ 2.9