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Basis of Presentation and Recent Developments (Details) - 6.50% Notes due 2024 - Senior Notes - USD ($)
1 Months Ended
Apr. 30, 2020
Mar. 31, 2019
Mar. 23, 2016
Debt [Line Items]      
Aggregate principal amount     $ 900,000,000
Interest rate, stated percentage   6.50% 6.50%
Subsequent Event [Member]      
Debt [Line Items]      
Debt Acquired $ 30,000,000    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 74.00%    
Long-term Debt $ 22,000,000    
Long-term Debt, Accrued Interest 1,000,000    
Gain (Loss) on Extinguishment of Debt $ 8,000,000