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Long-Term Debt (Term Loan And Revolver) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 2 Months Ended 3 Months Ended 2 Months Ended 3 Months Ended 21 Months Ended
Dec. 31, 2011
Term Loan [Member]
Sep. 30, 2013
Term Loan [Member]
Sep. 30, 2012
Term Loan [Member]
Nov. 09, 2011
Term Loan [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Nov. 09, 2011
Revolving Credit Facility [Member]
Sep. 30, 2013
LIBOR [Member]
Term Loan [Member]
Mar. 31, 2013
LIBOR [Member]
Term Loan [Member]
Debt Instrument [Line Items]                
Credit agreement, maximum capacity       $ 600   $ 100    
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%              
Interest addition to floating rate             2.25% 2.50%
Interest expense   $ 3.5 $ 4.1          
Revolver credit agreement term, years         5 years