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Commitment and Contingencies - Credit Agreements (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 31, 2022
Mar. 31, 2024
Dec. 31, 2023
Aug. 31, 2020
Nov. 30, 2019
Line of Credit Facility [Line Items]          
Long-term restricted cash   $ 12,000,000 $ 11,000,000    
Letters of credit outstanding   141,000,000 138,000,000    
Surety Bond          
Line of Credit Facility [Line Items]          
Collateralized agreements   465,000,000      
Long-term restricted cash   465,000,000      
Revolving Credit Facility | Unsecured Revolving Credit Facility Maturing November 19, 2024          
Line of Credit Facility [Line Items]          
Revolving credit facility, maximum borrowing capacity         $ 300,000,000
Revolving Credit Facility | Amended and Restated Revolving Credit and Guaranty Agreement Maturing August 7, 2025          
Line of Credit Facility [Line Items]          
Revolving credit facility, maximum borrowing capacity       $ 400,000,000  
Incremental revolving loan commitments       $ 100,000,000  
Unused commitment fee (percent) 0.10%        
Drawn from the revolving credit facility   0 0    
Letters of credit outstanding   $ 118,000,000 $ 115,000,000    
Revolving Credit Facility | Amended and Restated Revolving Credit and Guaranty Agreement Maturing August 7, 2025 | Higher of Federal Funds Rate or Composite Overnight Bank Borrowing Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate (percent) 0.50%        
Revolving Credit Facility | Amended and Restated Revolving Credit and Guaranty Agreement Maturing August 7, 2025 | Secured Overnight Financing Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate (percent) 1.00%        
Revolving Credit Facility | Amended and Restated Revolving Credit and Guaranty Agreement Maturing August 7, 2025 | Adjusted Secured Overnight Financing Rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate (percent) 1.00%