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Subsequent Events (Details) - USD ($)
$ in Millions
Oct. 29, 2020
Oct. 31, 2020
Sep. 30, 2020
Subsequent event      
Interest rate on senior notes due (as a percent)     7.25%
0.75% senior exchangeable notes due January 2024      
Subsequent event      
Interest rate on senior notes due (as a percent)     0.75%
5.75% senior notes due February 2025      
Subsequent event      
Interest rate on senior notes due (as a percent)     5.75%
Subsequent Event | 0.75% senior exchangeable notes due January 2024      
Subsequent event      
Interest rate on senior notes due (as a percent)   0.75%  
Subsequent Event | 6.50 notes due February 2025      
Subsequent event      
Interest rate on senior notes due (as a percent)   6.50%  
Senior notes transaction exchanged amount $ 115.0    
Amount of new notes $ 50.5    
Subsequent Event | 9.00% senior priority guaranteed notes due 2025      
Subsequent event      
Interest rate on senior notes due (as a percent) 9.00%    
Amount of new notes $ 300.0