Revenues - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ (33,688,000)	$ 3,186,850,000	$ 2,174,667,000	$ 8,433,248,000
Customer refunds	189,200,000	32,400,000	189,200,000	32,400,000
Contract liability	167,500,000		167,500,000		$ 1,700,000,000
Contract asset	53,700,000		53,700,000		55,500,000
Immaterial Bookings
Capitalized Contract Cost [Line Items]
Customer refunds	67,900,000		67,900,000
Commission, transportation and other
Capitalized Contract Cost [Line Items]
Prepaid travel agent commissions	7,900,000		$ 7,900,000		$ 163,200,000
Minimum
Capitalized Contract Cost [Line Items]
Length of cruise			1 day
Maximum
Capitalized Contract Cost [Line Items]
Length of cruise			25 days
Port Costs
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ 0	$ 184,000,000.0	$ 124,500,000	$ 509,600,000