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Share-Based Compensation (Tables)
9 Months Ended
Dec. 31, 2011
Share-Based Compensation [Abstract]  
Share-based compensation expense
                                 
    Quarter Ended     Nine Months Ended  
    December 31,     December 31,  
    2011     2010     2011     2010  
    (In millions)  
Cost of license revenue
  $ 1.1     $ 0.9     $ 3.4     $ 2.4  
Cost of maintenance revenue
    3.7       2.5       11.0       7.0  
Cost of professional services revenue
    1.4       1.3       3.9       3.5  
Selling and marketing expenses
    9.3       8.2       28.4       25.7  
Research and development expenses
    3.1       2.3       9.6       7.1  
General and administrative expenses
    12.5       10.1       36.4       30.6  
 
                       
Total share-based compensation expense
  $ 31.1     $ 25.3     $ 92.7     $ 76.3