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Long-Term Debt (Term Loan And Revolver) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Dec. 31, 2005
Dec. 31, 2011
Nov. 09, 2011
Mar. 31, 2012
Old Term Loan [Member]
Mar. 31, 2011
Old Term Loan [Member]
Mar. 31, 2012
Old Term Loan [Member]
Mar. 31, 2011
Old Term Loan [Member]
Dec. 31, 2011
Term Loan [Member]
Mar. 31, 2012
Term Loan [Member]
Dec. 31, 2011
Term Loan [Member]
Mar. 31, 2012
Term Loan [Member]
Nov. 09, 2011
Term Loan [Member]
Nov. 09, 2011
Revolving Credit Facility [Member]
Nov. 09, 2011
LIBOR [Member]
Term Loan [Member]
Debt Instrument [Line Items]                            
Credit agreement, maximum capacity     $ 700                 $ 600 $ 100  
Debt instrument, face amount                       600    
Term loan period, years               5 years            
Term loan repayment as percentage of principal in year 1                   1.25%        
Term loan repayment as percentage of principal in year 2   1.25%                        
Term loan repayment as percentage of principal in year 3                   1.88%        
Term loan repayment as percentage of principal in year 4   1.88%                        
Term loan repayment as percentage of principal in year 5                   2.50%        
Quarterly scheduled principal payment                 7.5          
Interest addition to floating rate                           2.50%
Interest expense       0 1.8 2.7 5.5   4.3   6.8      
Revolver credit agreement term, years   5 years                        
Repayment of line of credit debt   $ 332.9                        
Original mortgage maturity term, years 5 years