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Financing Arrangement (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended
Dec. 31, 2011
Dec. 31, 2011
0.75% Convertible Senior Notes [Member]
years
Dec. 31, 2011
0.75% Convertible Senior Notes [Member]
days
years
Jul. 20, 2011
0.75% Convertible Senior Notes [Member]
Dec. 31, 2011
Convertible Note Hedge [Member]
Jul. 14, 2011
Convertible Note Hedge [Member]
Jul. 20, 2011
Warrants [Member]
Dec. 31, 2011
Warrants [Member]
Jul. 14, 2011
Warrants [Member]
Jul. 14, 2010
Warrants [Member]
Dec. 31, 2011
Liability Component [Member]
0.75% Convertible Senior Notes [Member]
Jul. 20, 2011
Liability Component [Member]
0.75% Convertible Senior Notes [Member]
Dec. 31, 2011
Equity Component [Member]
0.75% Convertible Senior Notes [Member]
Financing Arrangement [Line Items]                          
0.75% Convertible Senior Notes due 2016 maturity date   Jul. 15, 2016 Jul. 15, 2016                    
Convertible Senior Notes, Carrying Value $ 534,000,000                     $ 525,000,000  
Debt issuance costs   15,000,000 15,000,000               13,000,000   2,000,000
Conversion rate of Notes     31.5075                    
Principal amount 633,000,000 632,500,000 632,500,000 632,500,000                  
Face amount of Notes   1,000 1,000                    
Initial conversion price per share of Notes   $ 31.74 $ 31.74                    
Number of trading days greater than or equal to the initial conversion price     20                    
Consecutive trading days under conversion trigger     30                    
Number of trading day that trading price falls below 98% of last reported sales price multiplied by conversion rate     5                    
Consecutive trading days under conversion trigger, trading price     10                    
Trigger price as percent of conversion price 130.00%                        
Trigger price $ 41.26                        
Debt trading price as a percentage of stock price times conversion rate 98.00%                        
Effective interest rate   4.54% 4.54%                    
Strike price for convertible note hedge           31.74              
Amount paid for Convertible Note Hedge         107,000,000                
Shares covered by Hedge Transactions           19.9              
Proceeds from Warrants transaction             $ 65,000,000            
Shares covered by warrants issuance                   19.9      
Strike price of warrants               $ 41.14 $ 41.14        
Contractual interest rate of 0.75% Convertible Senior Notes due 2016 0.75% 0.75% 0.75%                    
Debt instrument remaining discount amortization period (in years)   4.5 4.5