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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 26 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Stock Repurchase Program, Authorized Amount   $ 300.0
Stock Repurchase Program, Period in Force   3 years
Stock Repurchased and Retired During Period, Shares 4.7 12.9
Stock Repurchased and Retired During Period, Value $ 119.2 $ 256.8