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Debt - Senior Secured Second Priority Notes (Details) - Senior Secured Second Priority Notes - USD ($)
Mar. 31, 2019
Jun. 30, 2016
7.50% Senior Notes, Due 2022    
Debt Instrument [Line Items]    
Aggregate principal amount   $ 610,000,000
Debt Instrument, Interest Rate, Stated Percentage 7.50% 7.50%
Aggregate principal amount redeemed $ 183,000,000  
7.75% Senior Notes, Due 2024    
Debt Instrument [Line Items]    
Aggregate principal amount   $ 625,000,000
Debt Instrument, Interest Rate, Stated Percentage 7.75% 7.75%
Aggregate principal amount redeemed $ 187,500,000