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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
May 16, 2012
Dec. 31, 2011
Mar. 31, 2012
Restricted stock units (RSUs)
May 31, 2012
Non-employee director restricted stock award
Y
Mar. 31, 2012
Performance-based restricted stock unit awards
Equity              
Issuance of common stock in connection with the exercise of stock options (in shares) 253,919            
Total proceeds from the exercise of stock options $ 9.7 $ 9.4          
Number of common stock share authorized before amendment to Restated Articles of Incorporation     100,000,000        
Number of common stock shares authorized 200,000,000   200,000,000 100,000,000      
Share Based Compensation              
Restricted stock granted (in shares)         391,050 16,842 138,700
Number of years from grant date that recipient is restricted from trading restricted stock (in years)           1  
Right to receive number common stock (in shares)         1    
Fair value of restricted stock granted (in dollars per share)         $ 57.42 $ 49.87  
Share Repurchase Program              
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) 7,883,033            
Accumulated Other Comprehensive (Loss) Income              
Foreign currency translation gain 8.8     10.4      
Unrealized loss on investments, net of tax (0.4)     (0.4)      
Minimum pension liability, net of tax (18.8)     (18.8)      
Total accumulated other comprehensive loss (10.4)     (8.8)      
Deferred tax assets in accumulated other comprehensive income, unrealized loss on investments 0.1     0.1      
Deferred tax assets in accumulated other comprehensive income, pension liabilities $ 11.5     $ 11.5