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Stockholders' Equity Stockholders' Equity (Stock-Based Compensation) (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended 84 Months Ended 0 Months Ended 30 Months Ended
Dec. 31, 2013
employee_group
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Jun. 30, 2004
Granted before June 30, 2004 [Member]
Jan. 01, 2007
Granted after June 30, 2004 and bfore January 1, 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise period after employment termination         3 months 1 year
Full exercise period       10 years    
Number of employee groups 2          
Dividend yield 0.00% 0.00% 0.00%      
Weighted-average fair value of employee stock options granted per share $ 113.74 $ 41.00 $ 84.94      
Stock based compensation expense $ 73.1 $ 73.9 $ 61.6      
Income tax benefit $ 28.1 $ 28.5 $ 22.8