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FAIR VALUE MEASUREMENTS. (Reported on Balance Sheet) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Level 1 [Member]
   
Fair Value Measurements Reported on Balance Sheet [Line Items]    
Total $ 2,089.5 $ 1,592.1
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value Measurements Reported on Balance Sheet [Line Items]    
Cash equivalents 1,046.6 823.2
Investments held as available-for-sale 1,024.2 764.5
Investments held as trading 18.7 4.4
Level 2 [Member]
   
Fair Value Measurements Reported on Balance Sheet [Line Items]    
Total 232.9 198.4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value Measurements Reported on Balance Sheet [Line Items]    
Investments held as available-for-sale 158.0 198.4
Investments held as trading $ 74.9