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Stock Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Year
Dec. 31, 2009
Year
Stock-based compensation expense as included in the Consolidated Statements of Income [Line Items]      
Pre-tax stock-based compensation $ 18,948,000 $ 20,452,000 $ 21,761,000
Income Taxes 6,170,000 7,265,000 7,458,000
Stock-based compensation expense, net 12,778,000 13,187,000 14,303,000
Basic earnings per share impact $ 0.06 $ 0.06 $ 0.07
Diluted earnings per share impact $ 0.06 $ 0.06 $ 0.07
Unrecognized compensation costs [Abstract]      
Total Intrinsic Value of Options Excercised 1,000,000    
Shares Available for future grants 16,903,013    
Employee Stock Ownership Plan Esop Disclosures [Abstract]      
Granted Rights to purchase shares 258,667 318,556 540,660
Stock Options Transactions Shares [Roll Forward]      
Opening Balance 14,506,522    
Granted 1,312,910    
Exercised (55,484)    
Canceled (1,266,537)    
Forfeited (25,947)    
Closing Balance 14,471,464 14,506,522  
Options exercisable number of shares 11,478,630    
Stock Options Transactions Weighted Average Price per Share [Roll Forward]      
Opening Balance $ 37.38    
Granted $ 26.07    
Exercised $ 25.15    
Canceled $ 37.61    
Forfeited $ 27.27    
Closing Balance $ 36.42 $ 37.38  
Options exercisable Per Share Weighted Average Exercise Price $ 39.13    
The fair value of stock options granted and related assumptions [Abstract]      
Expected dividend yield 6.10% 6.10% 4.50%
Expected stock price volatility (1) 26.10% 25.60% 21.40%
Risk-free interest rate (2) 3.30% 3.20% 2.40%
Expected life - years (3) 7.4 7.3 7.5
Weighted-average fair value per option granted $ 3.45 $ 2.82 $ 3.04
Summary information about restricted stock unit transactions [Roll Forwad]      
Restricted stock units outstanding beginning 1,637,242    
Annual grant of restricted commons stock to non employee directors 662,049    
Vested (543,688)    
Forfeited (126,548)    
Restricted stock units outstanding ending 1,629,055 1,637,242  
Summary information about restricted stock unit weighted average grant date fair value [Roll Forwad]      
Restricted stock units weighted average grant date fair value - Beginning $ 25.55    
Granted weighted average grant date fair value $ 22.44    
Vested weighted average grant date fair value $ 26.89    
Forfeited weighted average grant date fair value $ 23.12    
Restricted stock units Weighted average grant date fair value - Ending $ 22.33 $ 25.55  
Intrinsic Value of retricted stock outstanding 30,000,000    
Intrinsic value of restricted stock vested 13,000,000 9,000,000 5,000,000
US ESPP [Member]
     
Employee Stock Ownership Plan Esop Disclosures [Abstract]      
Dicounted offering price 95.00%    
Grant Rights to purchase maximum number of common stock 5,108,794    
Stock Options [Member]
     
Unrecognized compensation costs [Abstract]      
Unrecognized Compensation Cost 19,000,000    
Weighted Average Period   0.7  
Employee Stock Ownership Plan Esop Disclosures [Abstract]      
Compensation Expenses amortization period   0.7  
Cost of Sales [Member]
     
Stock-based compensation expense as included in the Consolidated Statements of Income [Line Items]      
Pre-tax stock-based compensation 1,292,000 1,397,000 1,486,000
Cost of support services [Member]
     
Stock-based compensation expense as included in the Consolidated Statements of Income [Line Items]      
Pre-tax stock-based compensation 557,000 602,000 640,000
Cost of business services [Member]
     
Stock-based compensation expense as included in the Consolidated Statements of Income [Line Items]      
Pre-tax stock-based compensation 770,000 831,000 884,000
Selling, general and administrative [Member]
     
Stock-based compensation expense as included in the Consolidated Statements of Income [Line Items]      
Pre-tax stock-based compensation 15,689,000 16,936,000 18,020,000
Other Research And Development Expense Member
     
Stock-based compensation expense as included in the Consolidated Statements of Income [Line Items]      
Pre-tax stock-based compensation $ 640,000 $ 686,000 $ 731,000