Casino Promotional Allowances (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Estimated retail value of promotional allowances
Promotional allowances, retail value	$ 293.8	$ 309.8
Estimated cost of promotional allowances [Abstract]
Food and Beverage	113.2	123.1
Rooms	44.2	45.6
Other	12.3	12.5
Cost of Promotional Allowances	169.7	181.2
Food and Beverage [Member]
Estimated retail value of promotional allowances
Promotional allowances, retail value	159.4	167.9
Rooms [Member]
Estimated retail value of promotional allowances
Promotional allowances, retail value	110.6	118.2
Other [Member]
Estimated retail value of promotional allowances
Promotional allowances, retail value	$ 23.8	$ 23.7