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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 16, 2014
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Debt Instrument [Line Items]            
Long-term debt   $ 2,691,300,000   $ 2,691,300,000   $ 2,597,120,000
Revolver | Line of Credit            
Debt Instrument [Line Items]            
Credit agreement, maximum capacity   $ 450,000,000   $ 450,000,000    
Effective interest rate percentage   3.55%   3.55%    
Interest expense   $ 2,700,000 $ 1,300,000.0 $ 7,300,000 $ 1,300,000  
Proceeds from line of credit   0 225,000,000 200,000,000 225,000,000  
Repayments of debt   100,000,000 0 100,000,000 0  
Long-term debt   $ 275,000,000   $ 275,000,000   175,000,000
Revolver | Line of Credit | LIBOR | Minimum            
Debt Instrument [Line Items]            
Interest addition to floating rate       1.25%    
Revolver | Line of Credit | LIBOR | Maximum            
Debt Instrument [Line Items]            
Interest addition to floating rate       1.75%    
Term Loan B            
Debt Instrument [Line Items]            
Credit agreement, maximum capacity $ 800,000,000          
Term loan period, years 7 years          
Term loan quarterly repayment as percentage of principal 0.25%          
Effective interest rate percentage   3.65%   3.65%    
Interest expense   $ 6,900,000 $ 6,000,000 $ 19,700,000 $ 19,000,000  
Long-term debt   $ 766,300,000   $ 766,300,000   $ 772,120,000
Term Loan B | LIBOR            
Debt Instrument [Line Items]            
Interest addition to floating rate       2.00%