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Debt And Liquidity (2020 Senior Secured Notes) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Debt Instrument [Line Items]  
Debt Instrument, Event Of Default, Percentage Of Debt Held 30.00%
2020 Senior Secured Notes  
Debt Instrument [Line Items]  
Debt Instrument, Face Amount $ 500
Debt Instrument, Interest Rate, Stated Percentage 4.625%
Debt Instrument, Covenant, Restricted Payments Allowable With No Default Or Event Of Default, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum 2.00
Debt Instrument, Covenant, Restricted Payments Allowable Pursuant To Certain Baskets, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum 2.00
2020 Senior Secured Notes | Debt Instrument, Redemption, Period One  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 40.00%
Debt Instrument, Redemption Price, Percentage 104.625%
Debt Instrument, Redemption Price, Premium Applicable, Percentage 100.00%