Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended				3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Boomtown New Orleans Room	Sep. 30, 2014 River Downs	Jul. 31, 2013 River Downs	Sep. 30, 2014 Indiana Income Tax	Sep. 30, 2014 Minimum Indiana Income Tax	Sep. 30, 2014 Maximum [Member] Indiana Income Tax
Long-term Purchase Commitment [Line Items]
Income Tax Examination, Year under Examination							2005	2007
Amended Guaranteed Maximum Price					$ 131.0
Guaranteed Maximum Construction Costs			14.2	20.1
Self Insurance Reserve	26.7	26.2
Long-term Contract, Number of Guest Rooms			150
Income Tax Examination, Proposed Adjustment Excluding Interest and Penalties						$ 7.3