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Fair Value Measurements and Derivatives (Details) T in Thousands, € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($) T	Sep. 30, 2026 EUR (€) T	Dec. 31, 2025 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 13,900.0		$ 14,100.0
Fair value of long-term debt in excess of carrying value	$ 1,500.0		$ 900.0
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	Dec. 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	$ 324.9	€ 286.8
Designated as Hedging Instrument \| Fuel contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Projected fuel purchases \| T	475	475
Designated as Hedging Instrument \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 3,300.0	€ 2,900.0
NCLH \| Exchangeable Senior Notes Due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	5.7
NCLH \| 1.125% Exchangeable Senior Notes Due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	0.7
NCLH \| 2.5% Exchangeable Senior Notes Due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	13.5
NCLH \| 0.875% Exchangeable Senior Notes Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 41.0