Property and Equipment, Net (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property and equipment, net
Land and land improvements	$ 7,420.5	$ 7,411.8
Land concessions	504.4	606.7
Buildings, riverboats, and improvements	8,965.4	8,944.5
Furniture, fixtures, and equipment	2,395.7	2,353.2
Construction in progress	348.3	361.1
Total, Gross	19,634.3	19,677.3
Less: accumulated depreciation	(2,958.2)	(2,607.4)
Total, Net	$ 16,676.1	$ 17,069.9