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Shareholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Dividend Declared [Member]
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]      
Foreign currency translation gain (loss) $ 194.1 $ 154.8  
Translation gain (loss) on net investment hedge (23.1) (11.4)  
Translation gain (loss) on long-term intercopany loans (79.8) (89.1)  
Unrealized gain (loss) on investments, net of tax 10.4 8.2  
Defined benefit pension plans, net of tax (26.1) (26.5)  
Retiree health care plan, net of tax (0.7) (0.7)  
Accumulated other comprehensive income (loss) 74.8 35.3  
Unrealized gain on investments, tax 3.5 2.8  
Defined benefit pension plans, tax 19.4 19.5  
Retiree health care plan, tax $ 0.5 $ 0.5  
Subsequent Event [Line Items]      
Subsequent event date     May 02, 2012
Amount (dollars per share)     $ 0.43