Long-term Debt - Additional Information (Details) - USD ($)		9 Months Ended
	Aug. 20, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Borrowings
Borrowings from revolving credit facility		$ 0	$ 22,000,000.0
Repayments of revolving credit facility		0	$ 22,000,000.0
Letters of credit outstanding		$ 21,000,000		$ 22,800,000
5.55% Notes due 2040
Borrowings
Interest rate (as a percent)	5.55%	5.55%
Aggregate principal amount	$ 500,000,000
Debt discount	7,300,000
Proceeds from of debt	492,700,000
Debt issuance costs	$ 1,000,000
5.25% Notes due 2035
Borrowings
Interest rate (as a percent)	5.25%	5.25%
Aggregate principal amount	$ 500,000,000
Debt discount	5,000,000
Proceeds from of debt	495,000,000
Debt issuance costs	$ 1,000,000
Revolving credit facility | Revolving credit facility | Line of Credit
Borrowings
Borrowings from revolving credit facility		$ 0
Repayments of revolving credit facility		0
Revolving credit facility		0		0
Availability under revolving line of credit		1,000,000,000		$ 1,000,000,000
Letter of credit | Revolving credit facility
Borrowings
Availability under revolving line of credit		59,000,000
Maximum borrowing capacity		$ 80,000,000