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Acquisitions and Other Investments - Additional Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 01, 2017
USD ($)
Aug. 01, 2016
USD ($)
Jun. 30, 2019
USD ($)
renewal_option
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
1st Jackpot Casino          
Business Acquisition [Line Items]          
Net assets acquired $ 47.0        
Rocket Speed          
Business Acquisition [Line Items]          
Net assets acquired   $ 60.5      
Percentage acquired   100.00%      
Contingent consideration, period   2 years      
Multiple applied to then-trailing 12 months of EBITDA to determine contingent consideration   6.25      
Contingent consideration, cap   $ 110.0      
Contingent consideration (up to)   34.4      
Benefit from buyout of contingent purchase price consideration       $ 22.2 $ 22.2
Rocket Speed | Employee retention compensation          
Business Acquisition [Line Items]          
Contingent consideration (up to)   $ 10.0      
Scenario, Forecast | Greektown Casino-Hotel          
Business Acquisition [Line Items]          
Net assets acquired     $ 300.0    
Annual rent     $ 55.6    
Lease term     15 years    
Number of lease renewal options | renewal_option     4    
Lease renewal term     5 years