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LONG-TERM DEBT - Senior Unsecured Fixed Rate Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Feb. 18, 2020
Dec. 20, 2016
May 31, 2016
Debt Instrument [Line Items]                
Long-term debt $ 3,620,000,000   $ 3,620,000,000   $ 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 9,300,000 $ 4,400,000 27,800,000 $ 4,400,000        
Long-term debt 900,000,000   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 8,700,000 4,200,000 26,000,000.0 4,200,000        
Long-term debt 900,000,000   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 12,500,000 $ 12,500,000 37,500,000 $ 37,500,000        
Debt premium issue price percentage             102.75%  
Long-term debt $ 850,000,000   $ 850,000,000   $ 850,000,000