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Other Loans (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2011
Jun. 30, 2010
Jun. 30, 2009
Debt Instrument [Line Items]        
Balance at beginning $ 1,121.1 $ 1,398.3    
Long and short-term loans raised 1,543.8 1,167.9 1,619.9 1,312.3
Long and short-term loans repaid (1,330.8) (654.6) (1,637.5) (993.5)
Balance at close 1,398.3 1,907.7 1,121.1  
Uncollateralized | Other loans
       
Debt Instrument [Line Items]        
Balance at beginning     136.5  
Long and short-term loans raised 39.4 56.7 134.5  
Long and short-term loans repaid (41.9) (56.7) (284.1)  
Translation $ 2.5   $ 13.1