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Stockholders' Equity And Benefit Plans (Schedule Of Common Stock Repurchase Activity) (Details) (USD $)
In Millions, unless otherwise specified
 20 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Period Authorized Fiscal Year 2010 No Termination Date [Member]
Dec. 31, 2011
Period Authorized Fiscal Year 2010 No Termination Date [Member]
Mar. 31, 2012
Period Authorized Fiscal Year 2010 Termination Date December 2013 [Member]
Dec. 31, 2011
Period Authorized Fiscal Year 2010 Termination Date December 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares repurchased   0 0 0.6 3.1
Dollar value repurchased $ 509.4 $ 0 $ 0 $ 59.3 $ 270.9
Dollar value authorized   $ 30.0   $ 750.0  
Common stock repurchase activity Termination date   None   December 2013