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Common Stock Purchase Programs Common Stock Purchase Programs Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2012
Equity [Abstract]  
Share Repurchase Program, Original Authorization, Date 1995
Stock Repurchase Program, Authorized Amount 8,000,000
Common Shares Purchased and Retired Under Repurchase Program, Total 4,800,000
Shares Purchased Under Repurchase Program, Total Value $ 130.9
Shares Repurchased Under Repurchase Program, Average Value Per Share $ 27.16
Share Repurchase Program March 2000 Authorization, Number of Shares 4,000,000
Share Repurchase Program, March 2000 Authorization, Total Shares Repurchased 818,000
Share Repurchase Program, March 2000 Authorization, Total Share Repurchase Value $ 26.9
Share Repurchase Program, March 2000 Authorization, Shares Repurchased Average Value Per Share $ 32.82
Share Repurchase Program, Latest Repurchase, Date 2005
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 3,200,000