Basis Of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 D	Jun. 30, 2011 D	Jun. 30, 2012 D	Jun. 30, 2011 D	Dec. 31, 2011
Promotional Allowance [Line Items]
Live Racing Days	122	105	178	167
Customer Loyalty Program Liability	$ 1.9		$ 1.9		$ 2.7
Promotional Allowances	9.3	5.1	15.5	10.3
Estimated Cost Of Providing Promotional Allowances	1.2	0.8	2.4	2.1
Racing Operations
Promotional Allowance [Line Items]
Promotional Allowances	0.3	0.6	0.5	1.0
Online Operations
Promotional Allowance [Line Items]
Promotional Allowances	6.5	2.8	10.0	5.2
Gaming Operations
Promotional Allowance [Line Items]
Promotional Allowances	$ 2.5	$ 1.7	$ 5.0	$ 4.1