v3.26.1
Debt - Facility (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2026
USD ($)
Apr. 30, 2024
Mar. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Oct. 01, 2026
Sep. 30, 2026
Apr. 30, 2026
USD ($)
Feb. 28, 2026
assessment
Dec. 31, 2025
USD ($)
Sep. 30, 2025
Jul. 31, 2025
assessment
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2024
Oct. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]                                
Total long-term debt       $ 2,719,676,000         $ 3,100,274,000              
Facility                                
Debt Instrument [Line Items]                                
Debt cover ratio 2.50 2.50 2.50                          
Restricted cash required     $ 23,500,000                          
Debt service reserve account $ 23,500,000     23,500,000                        
Number of covenant assessment dates | assessment               2     2          
Facility | Facility, July 2025 Amendment                                
Debt Instrument [Line Items]                                
Debt cover ratio 4.25   4.25             4.0            
Facility | Facility, February 2026 Amendment, Excluding Mauritania And Senegal Business Units                                
Debt Instrument [Line Items]                                
Debt cover ratio 4.5   4.5                          
Facility | Forecast | Facility, July 2025 Amendment                                
Debt Instrument [Line Items]                                
Debt cover ratio           3.50                    
Facility | Forecast | Facility, February 2026 Amendment                                
Debt Instrument [Line Items]                                
Debt cover ratio         3.5 4.25                    
Facility | Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity       1,200,000,000     $ 1,250,000,000                  
Total long-term debt       800,000,000                        
Undrawn availability       440,000,000                        
Interval period for payment of interest (in months)   6 months                            
Commitment fees percentage   30.00%                            
Unavailable capacity commitment fee percentage   20.00%                            
Facility | Revolving Credit Facility | Minimum                                
Debt Instrument [Line Items]                                
Applicable margin (as a percent)   4.00%                            
Facility | Revolving Credit Facility | Maximum                                
Debt Instrument [Line Items]                                
Applicable margin (as a percent)   5.50%                            
Facility | Letter of Credit                                
Debt Instrument [Line Items]                                
Letters of credit issued       0                        
Facility | Revolving Credit Facility                                
Debt Instrument [Line Items]                                
Total long-term debt       $ 773,000,000         1,200,000,000              
Facility Interest or Senior Notes                                
Debt Instrument [Line Items]                                
Period for contractual future interest payments       6 months                        
7.750% Senior Notes | Senior Notes                                
Debt Instrument [Line Items]                                
Total long-term debt       $ 99,973,000         350,000,000              
Interest rate (as a percent)                             7.75%  
7.500% Senior Notes | Senior Notes                                
Debt Instrument [Line Items]                                
Total long-term debt       400,274,000         400,274,000              
Interest rate (as a percent)                               7.50%
8.750% Senior Notes | Senior Notes                                
Debt Instrument [Line Items]                                
Total long-term debt       500,000,000         500,000,000              
Interest rate (as a percent)                         8.75%      
3.125% Convertible Senior Notes | Senior Notes                                
Debt Instrument [Line Items]                                
Total long-term debt       $ 400,000,000         $ 400,000,000              
Interest rate (as a percent)       3.125%         3.125%     3.125%   3.125%