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Long-Term Debt Long Term Debt (Term Loan B) (Details) - USD ($)
2 Months Ended 12 Months Ended
Jan. 16, 2014
Dec. 31, 2011
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Nov. 09, 2011
Term Loan A [Member]            
Debt Instrument [Line Items]            
Credit agreement, maximum capacity           $ 600,000,000
Term loan period, years   5 years        
Term loan repayment as percentage of principal in year 1   1.25%        
Interest expense     $ 7,700,000 $ 13,700,000 $ 15,500,000  
Term Loan B [Member]            
Debt Instrument [Line Items]            
Credit agreement, maximum capacity $ 800,000,000          
Term loan period, years 7 years          
Term loan repayment as percentage of principal in year 1 0.25%          
Interest addition to floating rate 0.75%          
Interest expense     26,100,000 $ 11,900,000    
Senior Notes [Member]            
Debt Instrument [Line Items]            
Interest expense     $ 20,600,000      
LIBOR [Member] | Term Loan A [Member]            
Debt Instrument [Line Items]            
Interest addition to floating rate     2.50%      
LIBOR [Member] | Term Loan B [Member]            
Debt Instrument [Line Items]            
Interest addition to floating rate 2.50%