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Long-Term Debt - 4.50 Percent Notes (Details) - USD ($)
6 Months Ended
Dec. 16, 2020
Dec. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]        
Early repayment of senior debt     $ 281,000,000 $ 0
4.50 percent notes due 2028 | Prior to December 15, 2023        
Debt Instrument [Line Items]        
Redemption Price     104.50%  
4.50 percent notes due 2028 | Senior Notes        
Debt Instrument [Line Items]        
Interest rate (percent)   4.50% 4.50%  
Principle amount of debt   $ 275,000,000    
Proceeds from debt issuances   $ 270,000,000    
Percentage of principal that may be redeemed     35.00%  
Percentage of principal outstanding     65.00%  
4.50 percent notes due 2028 | Senior Notes | Prior to December 15, 2023        
Debt Instrument [Line Items]        
Redemption Price   100.00%    
4.50 percent notes due 2028 | Senior Notes | 2023        
Debt Instrument [Line Items]        
Redemption Price   102.25%    
4.50 percent notes due 2028 | Senior Notes | 2024        
Debt Instrument [Line Items]        
Redemption Price   101.125%    
4.50 percent notes due 2028 | Senior Notes | 2025 and thereafter        
Debt Instrument [Line Items]        
Redemption Price   100.00%    
4.50 percent notes due 2028 | Senior Notes | Change In Control Redemption        
Debt Instrument [Line Items]        
Redemption Price     101.00%  
6.25 percent notes due 2024 | Senior Notes        
Debt Instrument [Line Items]        
Interest rate (percent) 6.25%   6.25%  
Early repayment of senior debt $ 275,000,000 $ 275,000,000    
Debt $ 450,000,000 $ 450,000,000 $ 175,000,000  
Redemption Price 102.083%