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Fair Value Measurements and Derivatives (Details) T in Thousands, $ in Thousands, € in Millions	6 Months Ended
	Jun. 30, 2026 USD ($) T	Jun. 30, 2026 EUR (€) T	Dec. 31, 2025 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 14,300,000		$ 14,100,000
Fair value of long-term debt in excess of carrying value	$ 1,200,000		$ 900,000
Fuel contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative maturing date	Dec. 31, 2027
Not Designated as Hedging Instrument \| Fuel contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative maturing date	Oct. 31, 2027
Projected fuel purchases \| T	30	30
Not Designated as Hedging Instrument \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 447,100	€ 391.4
Designated as Hedging Instrument \| Fuel contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Projected fuel purchases	611
Designated as Hedging Instrument \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 3,300,000	€ 2,900.0