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Debt and Other Credit Facilities (Senior Notes) (Details) - Senior Notes - Notes Due 2028 - USD ($)
6 Months Ended
Sep. 30, 2020
Jun. 30, 2021
Debt Instrument [Line Items]    
Interest rate, stated percentage 4.75%  
Net proceeds from offering fee $ 245,000,000  
Interest rate, stated redeem percentage   35.00%
Prior to September 30, 2023    
Debt Instrument [Line Items]    
Redemption price, percentage   100.00%
On or after September 30, 2023    
Debt Instrument [Line Items]    
Redemption price, percentage   104.75%
Change of control    
Debt Instrument [Line Items]    
Redemption price, percentage   101.00%
Centauri LLC    
Debt Instrument [Line Items]    
Aggregate principal amount $ 250,000,000