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LONG-TERM DEBT - Senior Unsecured Fixed Rate Notes (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Feb. 18, 2020
Dec. 20, 2016
May 31, 2016
Debt Instrument [Line Items]            
Long-term debt $ 3,617,500,000 $ 4,227,500,000        
Senior Notes | Senior Notes 2030            
Debt Instrument [Line Items]            
Debt instrument face amount       $ 900,000,000    
Debt instrument stated interest rate       4.125%    
Interest expense 37,000,000.0 13,700,000        
Long-term debt 900,000,000 900,000,000        
Senior Notes | Senior Notes 2028            
Debt Instrument [Line Items]            
Debt instrument face amount       $ 900,000,000    
Debt instrument stated interest rate       3.875%    
Interest expense 34,800,000 12,900,000        
Long-term debt 900,000,000 900,000,000        
Senior Notes | Senior Notes 2026            
Debt Instrument [Line Items]            
Debt instrument face amount         $ 250,000,000 $ 600,000,000
Debt instrument stated interest rate           5.875%
Interest expense 49,900,000 49,900,000 $ 49,900,000      
Debt premium issue price percentage         102.75%  
Long-term debt $ 850,000,000 $ 850,000,000