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Fair Value Measurements - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
payment
Dec. 31, 2019
USD ($)
payment
Jan. 19, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities $ 18.7 $ 40.5  
Unrealized gains (losses) $ (21.8)    
Interest rate 5.625%    
Plainridge Park Casino      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Period of actual earnings used to calculate contingent consideration 10 years    
Number of remaining annual payments | payment 6 6  
Absolute Gaming      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Period of actual earnings used to calculate contingent consideration 2 years    
Number of remaining annual payments | payment 1    
Senior notes | 5.625% Notes due 2027      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate 5.625% 5.625% 5.625%
Retama Nominal Holder, LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ownership interest 1.00%    
Pinnacle Retama Partners, LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Ownership interest by parent 75.50%    
Pinnacle Retama Partners, LLC | Other assets | Retama Development Corporation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Promissory notes $ 15.1 $ 15.1  
Pinnacle Retama Partners, LLC | Other assets | Local government bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment, at amortized cost $ 6.6 $ 6.7