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Stock Incentive Plans And Stock Purchase Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Shares available for future grants and awards under the Stock Incentive Plans1,300,000 1,300,000 
Stock-based compensation expense related to the Stock Incentive Plans and the Non-Qualified Plan$ 6.8$ 6.7$ 20.0$ 19.1
Net excess tax benefit recognized in additional paid-in capital related to the exercise of stock options and the vesting of restricted stock  $ 6.8 
2008 Incentive Compensation Plan [Member]
    
Shares available for future grants and awards under the Stock Incentive Plans6,000,000 6,000,000 
Number of shares granted  0 
1996 Non-Qualified Employee Stock Purchase Plan [Member]
    
Percentage of market value of common stock at which employees are permitted to purchase  85.00% 
Shares issued under Non-Qualified plan  87,275 
Shares reserved for issuance under the Non-Qualified plan587,000 587,000 
Stock Options [Member]
    
Number of years over which options become exercisable on a pro rata basis  3 
Vesting period of options, maximum years  10 
Number of shares granted  41,400 
Restricted Stock [Member]
    
Vesting period of options, years  3 
Number of shares granted  426,708 
Deferred Stock Award [Member]
    
Vesting period of options, years  5