Creative Casinos of Louisiana acquisition (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended			3 Months Ended
	Jul. 18, 2012	Jul. 16, 2012	Mar. 14, 2012	Mar. 31, 2013
Creative Casinos of Louisiana acquisition [Abstract]
Significant Asset Acquisition, Project Completion Deposit				$ 25.0
Ground Lease Obligation, Rent Payable Prior to Property Opening				0.7
Ground Lease Obligation, Rent Payable Subsequent to Property Opening				1.3
Ground Lease Obligation, Maximum Annual Increase Percentage				5.00%
Ground Lease Obligation, Annual Rent Expense Amount				1.3
Ground Lease Obligation, Required Deposit Amount				5.0
Ground Lease Obligation, Total Deposit Amount at Balance Sheet Date				4.5
Ground Lease Obligation, Current Deposit Amount at Balance Sheet Date				0.7
Significant Asset Acquisition, Acquisition Cost				32.5
Significant Asset Acquisition, Indemnification Obligations Escrow Deposit				5.0
Significant Asset Acquisition, License Conditions Investment Amount				500
Significant Asset Acquisition, Expected Project Cost Minimum				560
Significant Asset Acquisition, Expected Project Cost Maximum				580
Ground Lease Obligation, Deposit Monthly Rent Payments Time Period				12 months
Significant Asset Acquisition, Purchase Price Allocation of Design Plans and Fees				2.7
Significant Asset Acquisition, Purchase Price Allocation of Gaming Right				$ 29.8
Significant Asset Acquisition, Period of Agreement			18 months
Significant Asset Acquisition, Length of Project		2 years
Ground Lease Obligation, Term of Lease	5 years