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Stock-Based Compensation (Stock-Based Compensation Costs) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stock-Based Compensation    
Restricted stock and restricted stock units $ 0.9 $ 1.2
Stock options, performance awards and other 0.1 0.3
Expense included in selling, general and administrative and advanced technology costs $ 1.0 $ 1.5