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Stockholders' Equity (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended
Jun. 11, 2010
Mar. 31, 2012
Mar. 31, 2011
Components of Stockholders' Equity [Line Items]      
Total intrinsic value of options exercised   $ 11.7 $ 44.1
Cash received from option exercised   1.2 6.8
Weighted-average fair value of employee stock options granted per share   $ 55.65 $ 109.21
Stock repurchase plan, authorized amount 300.0    
Stock repurchase program, remaining authorized repurchase amount   $ 41.0  
Two Thousand And Eleven Stock Plan [Member]
     
Components of Stockholders' Equity [Line Items]      
Common Stock, Capital Shares Reserved for Future Issuance   5.5  
Two Thousand And Two Stock Plan [Member]
     
Components of Stockholders' Equity [Line Items]      
Common Stock, Capital Shares Reserved for Future Issuance   1.2