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Split-Tenor 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 | Split tenor revolving credit facility
        
Debt Instrument [Line Items]        
Balance at beginning 430.0   498.5  
Long and short-term loans raised 70.0 540.0 221.0  
Long and short-term loans repaid (500.0) (40.0) (289.5)  
Balance at end   $ 500.0 $ 430.0