Casino Promotional Allowances (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Promotional Allowances	$ 286.6	$ 281.4	$ 579.2	$ 569.1
Cost of Promotional Allowances	175.0	159.0	350.5	324.0
Food and Beverage [Member]
Promotional Allowances	158.7	150.8	320.5	307.1
Cost of Promotional Allowances	119.6	108.7	238.7	219.0
Rooms [Member]
Promotional Allowances	106.0	109.7	213.1	217.6
Cost of Promotional Allowances	41.2	41.7	84.1	84.4
Other Promotional Allowances [Member]
Promotional Allowances	21.9	20.9	45.6	44.4
Cost of Promotional Allowances	$ 14.2	$ 8.6	$ 27.7	$ 20.6