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DEBT - Term Note (Details) - USD ($)
1 Months Ended 2 Months Ended 9 Months Ended
Aug. 31, 2019
Nov. 30, 2018
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Short-term Debt [Line Items]          
Repayment of term note       $ 650,000,000 $ 0
Term note          
Short-term Debt [Line Items]          
Face amount   $ 1,000,000,000.0      
Debt instrument term   1 year      
Repayment of term note $ 650,000,000   $ 350,000,000    
Term note | LIBOR          
Short-term Debt [Line Items]          
Basis spread on variable rate       1.15%  
Term note | LIBOR | Minimum          
Short-term Debt [Line Items]          
Basis spread on variable rate       1.00%  
Term note | Federal Funds Rate | Minimum          
Short-term Debt [Line Items]          
Basis spread on variable rate       0.50%