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Comprehensive Income (Tables)
9 Months Ended
Jun. 30, 2011
Comprehensive Income and Stockholders' Equity [Abstract]  
Reconciliation of net income (loss) to comprehensive income (loss)
                                 
    Three Months Ended   Nine Months Ended
    June 30,   June 30,
    2011   2010   2011   2010
    (In millions)  
Net income
  $ 28.7     $ 50.5     $ 36.0     $ 253.9  
Other comprehensive income:
                               
Unrealized gain related to available-for-sale
securities (see Note C)
    0.3       0.2             0.1  
 
                       
Comprehensive income
  $ 29.0     $ 50.7     $ 36.0     $ 254.0