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Stockholders' Equity And Earnings Per Share (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Apr. 30, 2012
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
2008 Stock Repurchase Program [Member]
Nov. 30, 2008
2008 Stock Repurchase Program [Member]
Apr. 30, 2012
2011 Stock Repurchase Program [Member]
Mar. 31, 2012
2011 Stock Repurchase Program [Member]
Nov. 30, 2011
2011 Stock Repurchase Program [Member]
Stockholders' Equity And Earnings Per Share [Line Items]                
Share repurchased, authorized         3,000,000     1,300,000
Remaining shares available for purchase       332,000     1,300,000  
Stock repurchased during period, shares 1,100,000         700,000 124,000  
Stock repurchased during period, value $ 69.0           $ 8.8  
Anti-dilutive equity-based awards outstanding   260,000 82,000