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Financial Instruments (Tables)
6 Months Ended
Sep. 30, 2011
Financial Instruments [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  
September 30, 2011   Total     (Level 1)     (Level 2)     (Level 3)     Technique  
    (In millions)  
Assets
                                       
Cash equivalents
                                       
Money-market funds
  $ 503.1     $ 503.1     $     $       A  
Certificates of deposit
    61.5       61.5                   A  
Short-term and long-term investments
                                       
United States Treasury securities
    50.0       50.0                   A  
Auction rate securities
    25.6                   25.6       B  
Mutual funds
    17.2       17.2                   A  
Foreign currency forward contracts
    11.8             11.8             A  
 
                               
Total
  $ 669.2     $ 631.8     $ 11.8     $ 25.6          
 
                               
Liabilities
                                       
Foreign currency forward contracts
  $ (8.6 )   $     $ (8.6 )   $       A  
 
                               
Total
  $ (8.6 )   $     $ (8.6 )   $          
 
                               
Summary of activity in Level 3 financial instruments
                                                 
    Quarter Ended     Six Months Ended  
    September 30, 2011     September 30, 2011  
    Auction                     Auction              
    Rate     Put             Rate     Put        
    Securities     Option     Total     Securities     Option     Total  
    (In millions)  
Balance at the beginning of the period
  $ 26.8     $     $ 26.8     $ 27.2     $     $ 27.2  
Redemption of auction rate securities
    (0.2 )           (0.2 )     (0.4 )           (0.4 )
Change in unrealized gain (loss) included in other comprehensive income
    (1.0 )           (1.0 )     (1.2 )           (1.2 )
 
                                   
Balance at the end of the period
  $ 25.6     $     $ 25.6     $ 25.6     $     $ 25.6  
 
                                   
                                                 
    Quarter Ended     Six Months Ended  
    September 30, 2010     September 30, 2010  
    Auction                     Auction              
    Rate     Put             Rate     Put        
    Securities     Option     Total     Securities     Option     Total  
    (In millions)  
Balance at the beginning of the period
  $ 45.2     $ 0.9     $ 46.1     $ 60.5     $ 1.1     $ 61.6  
Redemption of auction rate securities
    (11.4 )           (11.4 )     (27.5 )           (27.5 )
Change in unrealized gain (loss) included in interest and other income, net
    0.9       (0.9 )           1.1       (1.1 )      
Change in unrealized gain (loss) included in other comprehensive income
    (0.8 )           (0.8 )     (0.2 )           (0.2 )
 
                                   
Balance at the end of the period
  $ 33.9     $     $ 33.9     $ 33.9     $     $ 33.9  
 
                                   
Components of C&C equivalents and Investments
                                                 
    September 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
  $     $ 30.9     $ 19.1     $ 525.0     $ 27.8     $ 22.1  
Certificates of deposit
    61.5                   38.4              
Auction rate securities
                25.6                   27.2  
Trading
                                               
Mutual funds
                17.2                   18.5  
 
                                   
Total debt and equity investments measured at fair value
    61.5       30.9       61.9       563.4       27.8       67.8  
 
                                   
 
Cash on hand
    895.1                   412.8              
Money-market funds
    503.1                   684.7              
 
                                   
Total cash, cash equivalents and investments
  $ 1,459.7     $ 30.9     $ 61.9     $ 1,660.9     $ 27.8     $ 67.8  
 
                                   
Amounts included in accumulated other comprehensive income from available- for-sale securities (pre-tax):
                                               
Unrealized losses*
  $     $     $ 3.8     $     $     $ 2.6  
 
                                   
     
*  
The unrealized losses on available-for-sale securities at September 30, 2011 and March 31, 2011 relate to the auction rate securities.
Maturities of available for sale investments in debt
                 
            Fair  
    Cost     Value  
    (In millions)  
Due in one year or less
  $ 92.4     $ 92.4  
Due between one and two years
    19.1       19.1  
Due after ten years
    29.4       25.6  
 
           
Total
  $ 140.9     $ 137.1  
 
           
Notional amounts at contract exchange rates of foreign currency forward contracts
                 
    Notional Amount  
    September 30,     March 31,  
    2011     2011  
    (In millions)  
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)
               
 
Euro
  $ 140.7     $ 158.5  
Australian dollar
    32.6       13.9  
British pound
    15.6       5.0  
Chinese yuan renminbi
    9.8       7.6  
New Zealand dollar
    5.0       2.9  
Swiss franc
    4.5       1.5  
Danish krone
    3.7       3.0  
South Korean won
    3.0       4.6  
Norwegian krone
    2.9       2.0  
Brazilian real
    2.5       5.6  
Canadian dollar
          4.2  
Other
    6.3       4.2  
 
           
Total
  $ 226.6     $ 213.0  
 
           
 
               
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)
               
 
Israeli shekel
  $ 118.4     $ 151.6  
Indian rupee
    11.7       9.1  
Mexican peso
    4.6       9.3  
Other
    3.0       2.2  
 
           
Total
  $ 137.7     $ 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
  $ 48.0     $ 26.9     $ 9.9     $     $ 84.8  
Class 2
    11.6       7.3       2.5       1.2       22.6  
Class 3
    1.1       0.8       0.7       1.5       4.1  
 
                             
Balance at the end of the period
  $ 60.7     $ 35.0     $ 13.1     $ 2.7     $ 111.5