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Financial Instruments (Tables)
3 Months Ended
Jun. 30, 2011
Financial Instruments (Tables) [Abstract]  
Input levels and valuation techniques for determination of fair values of Financial Instruments
                                         
    Fair Value Measurements at Reporting Date Using  
            Quoted Prices in Active             Significant        
            Markets for Identical     Significant Other     Unobservable        
            Assets     Observable Inputs     Inputs     Valuation  
June 30, 2011   Total     (Level 1)     (Level 2)     (Level 3)     Technique  
    (In millions)  
Assets
                                       
Cash equivalents
                                       
Money-market funds
  $ 783.1     $ 783.1     $     $       A  
Certificates of deposit
    81.5       81.5                   A  
Short-term and long-term investments
                                       
United States Treasury securities
    49.9       49.9                   A  
Auction rate securities
    26.8                   26.8       B  
Mutual funds
    19.3       19.3                   A  
Foreign currency forward contracts
    1.5             1.5             A  
 
                               
Total
  $ 962.1     $ 933.8     $ 1.5     $ 26.8          
 
                               
Liabilities
                                       
Foreign currency forward contracts
  $ (2.7 )   $     $ (2.7 )   $       A  
 
                               
Total
  $ (2.7 )   $     $ (2.7 )   $          
 
                               
Summary of activity in Level 3 financial instruments
                                                 
    Quarter Ended June 30, 2011     Quarter Ended June 30, 2010  
    Auction                     Auction              
    Rate     Put             Rate     Put        
    Securities     Option     Total     Securities     Option     Total  
    (In millions)  
Balance at the beginning of the period
  $ 27.2     $     $ 27.2     $ 60.5     $ 1.1     $ 61.6  
Redemption of auction rate securities
    (0.2 )           (0.2 )     (16.2 )           (16.2 )
Change in unrealized gain (loss) included in interest and other income, net
                      0.2       (0.2 )      
Change in unrealized gain (loss) included in other comprehensive income
    (0.2 )           (0.2 )     0.7             0.7  
 
                                   
Balance at the end of the period
  $ 26.8     $     $ 26.8     $ 45.2     $ 0.9     $ 46.1  
 
                                   
Components of C&C equivalents and Investments
                                                 
    June 30, 2011     March 31, 2011  
    Cash and                     Cash and              
    Cash     Short-term     Long-term     Cash     Short-term     Long-term  
    Equivalents     Investments     Investments     Equivalents     Investments     Investments  
    (In millions)  
Measured at fair value:
                                               
Available-for-sale
                                               
United States Treasury securities
  $     $ 31.9     $ 18.0     $ 525.0     $ 27.8     $ 22.1  
Certificates of deposit
    81.5                   38.4              
Auction rate securities
                26.8                   27.2  
Trading
                                               
Mutual funds
                19.3                   18.5  
 
                                   
Total debt and equity investments measured at fair value
    81.5       31.9       64.1       563.4       27.8       67.8  
 
                                   
 
                                               
Cash on hand
    718.3                   412.8              
Money-market funds
    783.1                   684.7              
 
                                   
Total cash, cash equivalents and investments
  $ 1,582.9     $ 31.9     $ 64.1     $ 1,660.9     $ 27.8     $ 67.8  
 
                                   
Amounts included in accumulated other comprehensive income from available- for-sale securities (pre-tax):
                                               
Unrealized losses*
  $     $     $ 2.8     $     $     $ 2.6  
 
                                   
     
*  
The unrealized losses on available-for-sale securities at June 30, 2011 and March 31, 2011 relate to the auction rate securities.
Maturities of available for sale investments in debt securities
                 
            Fair  
    Cost     Value  
    (In millions)  
Due in one year or less
  $ 113.4     $ 113.4  
Due between one and two years
    18.0       18.0  
Due after ten years
    29.6       26.8  
 
           
Total
  $ 161.0     $ 158.2  
 
           
Notional amounts at contract exchange rates of foreign currency forward contracts
                 
    Notional Amount  
    June 30,     March 31,  
    2011     2011  
    (In millions)  
 
               
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)
               
 
               
Euro
  $ 197.5     $ 158.5  
Australian dollar
    25.3       13.9  
Brazilian real
    13.2       5.6  
British pound
    9.3       5.0  
Chinese yuan renminbi
    8.8       7.6  
New Zealand dollar
    4.4       2.9  
Swiss franc
    3.9       1.5  
South Korean won
    3.8       4.6  
Norwegian krone
    3.6       2.0  
Danish krone
    3.6       3.0  
Canadian dollar
          4.2  
Other
    5.0       4.2  
 
           
Total
  $ 278.4     $ 213.0  
 
           
 
               
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)
               
 
               
Israeli shekel
  $ 161.9     $ 151.6  
Indian rupee
    7.7       9.1  
Mexican peso
    6.2       9.3  
Other
    3.8       2.2  
 
           
Total
  $ 179.6     $ 172.2  
 
           
Finance Receivables Balance by region and by class of internal credit rating
                                         
    North America     EMEA     Asia Pacific     Latin America     Total  
    (In millions)  
Class 1
  $ 107.2     $ 38.8     $ 17.9     $ 0.5     $ 164.4  
Class 2
    24.1       34.8       2.2       1.5       62.6  
Class 3
    1.2       1.2       0.9       1.5       4.8  
 
                             
Balance at the end of the period
  $ 132.5     $ 74.8     $ 21.0     $ 3.5     $ 231.8