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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated Other Comprehensive Income (Loss) [Abstract]      
Foreign currency translation $ 54.3 $ 96.6 $ 111.0
Unrealized gain / (loss) on investments 8.2 8.0 6.6
Defined Benefit Plan Disclosure [Line Items]      
Accumulated other comprehensive income (loss) 35.3 87.0 106.9
Defined Benefit Pension Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plans (Note 8) (26.5) (19.1) (13.2)
Retiree Health Care Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plans (Note 8) $ (0.7) $ 1.5 $ 2.5