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Long Term Debt - Other Sr Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Feb. 20, 2024
Debt Instrument                      
Payments of Debt Issuance Costs           $ 35,000,000.0 $ 3,100,000 $ 26,400,000      
5.75% Senior Notes Maturing March 2027 | Senior Notes                      
Debt Instrument                      
Senior Notes         $ 750,000,000.0            
Debt Instrument, Interest Rate, Stated Percentage           5.75%          
Debt Instrument, Increase, Additional Borrowings         739,500,000            
Payments of Debt Issuance Costs         $ 10,500,000            
Long-term Debt           $ 0 459,300,000        
Additional Issuance of 5.75% Senior Notes Maturing in March 2027 | Senior Notes                      
Debt Instrument                      
Senior Notes       $ 750,000,000.0              
Debt Instrument, Interest Rate, Stated Percentage           5.75%          
Debt Instrument, Increase, Additional Borrowings       784,000,000.0              
Payments of Debt Issuance Costs       $ 7,200,000              
Debt Instrument, Issuance Price, Percentage of Par Value       105.50%              
5.625% Senior Notes Maturing January 2028 | Senior Notes                      
Debt Instrument                      
Debt Instrument, Interest Rate, Stated Percentage           5.625%          
Debt Instrument, Increase, Additional Borrowings     $ 990,600,000                
Payments of Debt Issuance Costs     $ 9,400,000                
Long-term Debt           $ 464,900,000 $ 939,900,000        
5.50% Senior Notes Maturing in December 2029 | Senior Notes                      
Debt Instrument                      
Senior Notes   $ 750,000,000.0                  
Debt Instrument, Interest Rate, Stated Percentage           5.50% 5.50%        
Debt Instrument, Increase, Additional Borrowings   743,000,000.0                  
Payments of Debt Issuance Costs   $ 7,000,000.0                  
Long-term Debt           $ 1,235,000,000 $ 1,235,000,000        
Additional 5.50% Senior Notes Maturing in December 2029 | Senior Notes                      
Debt Instrument                      
Debt Instrument, Interest Rate, Stated Percentage             5.50%        
Debt Instrument, Increase, Additional Borrowings               514,000,000.0      
Payments of Debt Issuance Costs               $ 3,500,000      
Debt Instrument, Issuance Price, Percentage of Par Value               103.50%      
Long-term Debt               $ 500,000,000.0      
Original Issuance of 4.625% Senior Notes Maturing in April 2030 | Senior Notes                      
Debt Instrument                      
Debt Instrument, Increase, Additional Borrowings                   $ 1,241,000,000  
Payments of Debt Issuance Costs                   9,000,000.0  
Long-term Debt $ 1,250,000,000                 1,250,000,000  
4.625% Senior Notes Maturing in April 2030 | Senior Notes                      
Debt Instrument                      
Debt Instrument, Interest Rate, Stated Percentage           4.625%          
Debt Instrument, Issuance Price, Percentage of Par Value               87.00%      
Long-term Debt           $ 1,385,400,000 $ 1,385,400,000        
Additional Issuance of 4.625% Senior Notes Maturing in April 2030 | Senior Notes                      
Debt Instrument                      
Debt Instrument, Increase, Additional Borrowings                   417,500,000  
Payments of Debt Issuance Costs                   4,500,000  
Debt Instrument, Issuance Price, Percentage of Par Value 105.50%                    
Long-term Debt $ 400,000,000.0                 $ 400,000,000.0  
4.50% Senior Notes Maturing in September 2031 | Senior Notes                      
Debt Instrument                      
Senior Notes                 $ 1,800,000,000    
Debt Instrument, Interest Rate, Stated Percentage           4.50%          
Debt Instrument, Increase, Additional Borrowings                 1,783,200,000    
Payments of Debt Issuance Costs                 $ 16,800,000    
Debt Instrument, Issuance Price, Percentage of Par Value               86.00%      
Long-term Debt           $ 980,600,000 1,049,700,000        
6.375% Senior Notes Maturing in March 2033 | Senior Notes                      
Debt Instrument                      
Senior Notes                     $ 1,200,000,000
Debt Instrument, Interest Rate, Stated Percentage           6.375%          
Debt Instrument, Increase, Additional Borrowings           $ 1,185,800,000          
Payments of Debt Issuance Costs           14,200,000          
Long-term Debt           $ 1,200,000,000 0        
6.25% Senior Notes Maturing in February 2032 | Senior Notes                      
Debt Instrument                      
Senior Notes                     $ 1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage           6.25%          
Debt Instrument, Increase, Additional Borrowings           $ 986,700,000          
Payments of Debt Issuance Costs           13,300,000          
Long-term Debt           $ 1,000,000,000 $ 0