v2.4.0.6
Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated other comprehensive loss $ (3,858.6) $ (2,670.1)  
Other Comprehensive Income (Loss), Net of Tax (1,188.5) (198.2) 314.9
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax 383.8    
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 64.4    
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 54.7 27.6 19.0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax 5.8 5.8 6.7
Accumulated Other Comprehensive Income (Loss) [Member]
      
Accumulated other comprehensive loss (3,858.6) (2,670.1)  
Other Comprehensive Income (Loss), Net of Tax (1,188.5)    
Accumulated Translation Adjustment [Member]
      
Accumulated other comprehensive loss 265.9 510.7  
Other Comprehensive Income (Loss), Net of Tax (244.8)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]
      
Accumulated other comprehensive loss 14.8 128.9  
Other Comprehensive Income (Loss), Net of Tax (114.1)    
Accumulated Defined Benefit Plans Adjustment [Member]
      
Accumulated other comprehensive loss (4,032.2) (3,175.8)  
Other Comprehensive Income (Loss), Net of Tax (856.4)    
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
      
Accumulated other comprehensive loss (107.1) (133.9)  
Other Comprehensive Income (Loss), Net of Tax $ 26.8