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Discontinued Operations and Assets Held for Sale - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2016
USD ($)
a
Nov. 30, 2013
USD ($)
Mar. 31, 2016
USD ($)
a
Mar. 31, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income before income tax from discontinued operations     $ 0.1 $ 0.2
Central City, Colorado        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Additional land for sale (acres) | a 2   2  
Land available-for-sale $ 0.3   $ 0.3  
Cash proceeds from sale of land $ 0.3      
Ameristar Lake Charles        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash consideration   $ 209.8    
Deferred consideration   $ 10.0    
Write-downs, reserves and recoveries, net | Central City, Colorado        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment charge       $ 2.6