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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
May 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jan. 16, 2014
Debt Instrument [Line Items]              
Long-term debt   $ 2,642,500,000   $ 2,642,500,000   $ 2,647,500,000  
Revolver | Line of Credit              
Debt Instrument [Line Items]              
Interest expense     $ 2,800,000 0 $ 4,600,000    
Credit agreement, maximum capacity   450,000,000   450,000,000      
Long-term debt   $ 0   $ 0      
Proceeds from line of credit     0   200,000,000    
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]              
Debt instrument face amount $ 1,000,000,000           $ 800,000,000
Proceeds from issuance of debt $ 1,000,000,000            
Term loan period, years       7 years      
Term loan quarterly repayment as percentage of principal       0.25%      
Effective interest rate percentage   4.09%   4.09%      
Interest expense   $ 10,300,000 $ 6,400,000 $ 20,100,000 $ 12,800,000    
Long-term debt   $ 992,500,000   $ 992,500,000   $ 997,500,000  
Term Loan B | LIBOR              
Debt Instrument [Line Items]              
Interest addition to floating rate       1.75%