Commitments and Contingencies (Leases) (Details) £ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 GBP (£)
Commitments and Contingencies
Expenses related to operating leases			$ 29.7	$ 52.0		$ 57.5
Brilliance of the Seas Vessel Lease
Commitments and Contingencies
Expenses related to operating leases				19.3	£ 11.7	$ 19.1	£ 12.3
Brilliance of the Seas
Commitments and Contingencies
Purchase price of Brilliance of the Seas, PPE addition	$ 275.4	£ 175.4		$ 275.4	£ 175.4