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Revolving Credit Facility (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]        
Long and short-term loans raised $ 1,543.8 $ 1,167.9 $ 1,619.9 $ 1,312.3
Collateralized | $1 billion revolving credit facility
        
Debt Instrument [Line Items]        
Long and short-term loans raised   483.0    
Long and short-term loans repaid   (263.0)    
Balance at end   $ 220.0