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Natural Disasters (Details) (Churchill Downs, Hail [Member], USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Business Interruption Loss [Line Items] |  |
Insurance Deductible |  | $ 0.5
Insurance Settlements, Partial Settlement Received |  | 0.6
Insurance Settlements, Cash Settlement Received | 0.4 | 1.1
Scenario, Forecast [Member] |  |
Business Interruption Loss [Line Items] |  |
Unusual or Infrequent Item, Net of Insurance Proceeds | $ 0.4 |

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