Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2014 crew_member	Dec. 31, 2015
Commitments and Contingencies
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate	58.00%		58.00%
Cruise ships on order
Commitments and Contingencies
Aggregate cost of ships on order, not including TUI cruises and Project Edge ships on order	$ 8,000.0
Deposit for the purchase of ships expected to enter service	$ 554.1
Class Action Complaint
Commitments and Contingencies
Number of crew members submitting demands for arbitration (in excess) | crew_member		575