Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended			9 Months Ended
	Nov. 30, 2008	Sep. 30, 2012 HRE Trust Fund	Jul. 08, 2011 HRE Trust Fund	Mar. 02, 2011 HRE Trust Fund member	Sep. 30, 2012 HRE Trust Fund Arlington Park Purses	Sep. 30, 2012 HRE Trust Fund Arlington Park Improvements, Marketing and Maintainance
Gain Contingencies [Line Items]
Period Of Time Public Act 94-804 Was Extended	3 years
Surcharge Of Revenues Of Illinois Riverboat Casinos	3.00%
Number Of Members Of The Seventh Circuit Court				3
Length Of Stay Related To Dissolutation Of A Temporary Restraining Order			30 days
Cash Received From Legal Proceedings		$ 45.4			$ 26.1	$ 19.3