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(LOSS) GAIN ON INVESTMENTS, NET (Details) (Common shares, USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended3 Months Ended
Mar. 31, 2011
Jun. 30, 2011
Mar. 14, 2011
Common shares
   
Marketable securities by major security type   
Investment in available-for-sale equity securities$ 60.0  
Number of shares of common stock acquired (in shares)1,034,908  
Percentage of outstanding common stock acquired (as a percent)  1.366%
Realized gain 21.3 
Net proceeds from disposal of investment $ 81.3