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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Restricted stock units (RSUs)
Mar. 31, 2012
Performance-based restricted stock unit awards
Equity          
Issuance of common stock in connection with the exercise of stock options (in shares) 114,416        
Total proceeds from the exercise of stock options $ 4.6 $ 3.9      
Share Based Compensation          
Restricted stock granted (in shares)       391,050 138,700
Right to receive number common stock (in shares)       1  
Fair value of restricted stock granted (in dollars per share)       $ 57.42  
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 18.0   10.4    
Unrealized loss on investments, net of tax (0.2)   (0.4)    
Minimum pension liability, net of tax (18.8)   (18.8)    
Total accumulated other comprehensive loss (1.0) 6.7 (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