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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 22, 2017
Jun. 30, 2019
Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Carrying value of the notes   $ 5,844.7 $ 5,695.1
Hypothetical interest rate increase   1.00%  
Hypothetical annual interest expense   $ 19.0  
Term Loan Facility [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Carrying value of the notes   $ 1,748.8 1,751.3
Term Loan Facility [Member] | LIBOR [Member] | Minimum      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Spread on interest rate 1.00% 1.00%  
Tranche One [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Debt instrument, face amount   $ 500.0  
Tranche One [Member] | LIBOR [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Spread on interest rate   2.00%  
Floor rate   0.00%  
Tranche Two (B-2 Term Loan) [Member] | LIBOR [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Spread on interest rate   2.25%  
Floor rate   1.00%  
Notes [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Carrying value of the notes   $ 4,001.1 4,003.4
Fair value of the notes   4,067.7 3,986.5
Notes [Member] | Term Loan Facility [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Fair value of the notes   1,758.0 1,772.3
Revolving Credit Facility [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Carrying value of the notes   $ 145.0 $ 0.0