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Short And Long-Term Debt Unsecured Notes (Details)
1 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Rate
Sep. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
Debt Instrument [Line Items]        
Proceeds from issuance of Senior Secured Second Lien Notes   $ 550,000,000 $ 0  
Amount that the cumulative credit basket for restricted payments was reset to on January 1, 2019       $ 0
Cumulative Credit Basket increase as a % of Consolidated Net Income when the consolidated leverage ratio is equal to or greater than 4.0 to 1.0 | Rate   25.00%    
Consolidated Leverage Ratio - Consolidated Net Income Build - Numerator   4.0    
Consolidated Leverage Ratio - Consolidated Net Income Build - Denominator   1.0    
Cumulative Credit Basket increase as a % of Consolidated Net Income when the consolidated leverage ratio is less than 4.0 to 1.0 | Rate   50.00%    
Percent of the deficit by which the cumulative credit basket is reduced when consolidated net income is in a deficit position | Rate   1    
General restricted payment basket may be used only for restricted investments (as defined in the indenture to the 9.375% notes)   $ 100,000,000    
Consolidated Leverage Ratio - Unlimited General Restricted Payment Basket - Numerator   3.0    
Consolidated Leverage Ratio - Unlimited Restricted Payment Basket - Denominator   1.0    
Max amount of shares repurchased and dividends declared per year under the 9.375 Credit Agreement   $ 45,000,000    
Net Debt Seasonality Adjustment   $ 200,000,000    
Secured Debt | 7.625% Senior Secured Second Lien Notes        
Debt Instrument [Line Items]        
Proceeds from issuance of Senior Secured Second Lien Notes $ 550      
Interest Rate   7.625%    
Senior Notes | 5.25% Senior Notes        
Debt Instrument [Line Items]        
Interest Rate   5.25%    
Senior Notes | 4.875% Senior Notes        
Debt Instrument [Line Items]        
Interest Rate   4.875%    
Senior Notes | 9.375% Senior Notes        
Debt Instrument [Line Items]        
Interest Rate   9.375%