Revenues - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ 175,605,000	$ 2,806,631,000	$ 2,208,355,000	$ 5,246,398,000
Customer refunds	467,900,000	25,500,000	467,900,000	25,500,000
Contract liability	161,800,000		161,800,000		$ 1,700,000,000
Contract asset	54,300,000		$ 54,300,000		55,500,000
Commission, transportation and other
Capitalized Contract Cost [Line Items]
Prepaid travel agent commissions					$ 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	$ 173,600,000	$ 124,500,000	$ 325,600,000