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Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Nov. 03, 2011
Dec. 31, 2010
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]        
Foreign currency translation gain (loss) $ 151.0 $ 186.6    
Translation gain (loss) on net investment hedge (33.8) (43.2)    
Translation gain (loss) on long-term intercopany loans (64.8) (89.1)    
Unrealized gain (loss) on investments, net of tax 9.9 8.2    
Defined benefit pension plans, net of tax (26.2) (26.5)    
Retiree health care plan, net of tax (0.7) (0.7)    
Accumulated other comprehensive income (loss) 35.4 35.3    
Unrealized gain on investments, tax 3.3 2.8    
Defined benefit pension plans, tax 19.4 19.5    
Retiree health care plan, tax $ 0.5 $ 0.5    
Share Repurchase Programs [Line Items]        
Shares authorized to be repurchased (in shares)     3,000,000 3,000,000
Shares repurchased (in shares) 878,897      
Dividend declaration date May 02, 2012      
Dividend paid (in dollars per share) $ 0.43      
Dividends Payable, Date Paid Jun. 15, 2012      
Dividends Payable, Date of Record Jun. 01, 2012      
Authorized in 2010 [Member]
        
Share Repurchase Programs [Line Items]        
Shares repurchased (in shares) 619,257      
Shares authorized to be repurchased remaining (in shares) 0      
Authorized in 2011 [Member]
        
Share Repurchase Programs [Line Items]        
Shares repurchased (in shares) 259,640      
Shares authorized to be repurchased remaining (in shares) 2,700,000