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Fair Value Measurements and Derivatives (Details) T in Thousands, € in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($) T	Jun. 30, 2025 EUR (€) T	Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 13,600.0		$ 12,800.0
Fair value of long-term debt in excess of carrying value	$ 600.0		$ 800.0
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	Oct. 31, 2027
Projected fuel purchases \| T	94	94
Designated as Hedging Instrument \| Fuel contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Projected fuel purchases \| T	913	913
Designated as Hedging Instrument \| Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 900.8	€ 764.2
NCLH \| Exchangeable Senior Notes Due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	5.1
NCLH \| 1.125% Exchangeable Senior Notes Due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	34.1
NCLH \| 2.5% Exchangeable Senior Notes Due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	13.7
NCLH \| Exchangeable Senior Notes Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount of derivatives	$ 13.5