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Investment in and Advances to Unconsolidated Affiliates - Additional Information (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
joint_venture
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
joint_venture
Investments in and Advances to Affiliates [Line Items]      
Number of immaterial joint ventures | joint_venture 2   2
Distributions from unconsolidated affiliates $ 47.5 $ 4.8  
Rivers Des Plaines      
Investments in and Advances to Affiliates [Line Items]      
Equity method investment, ownership percentage 61.30%   61.30%
Equity method investment, difference between carrying amount and underlying equity $ 832.8    
Equity method investment, amount 535.2   $ 519.0
Distributions from unconsolidated affiliates $ 25.3 1.3  
Miami Valley Gaming LLC      
Investments in and Advances to Affiliates [Line Items]      
Equity method investment, ownership percentage 50.00%   50.00%
Equity method investment, amount $ 108.3   $ 110.7
Distributions from unconsolidated affiliates $ 22.0 $ 3.5  
High Plaines | Rivers Des Plaines      
Investments in and Advances to Affiliates [Line Items]      
Equity method investment, ownership percentage 36.00%    
Casino Investors | Rivers Des Plaines      
Investments in and Advances to Affiliates [Line Items]      
Equity method investment, ownership percentage 2.70%    
Delaware North Companies Gaming & Entertainment Inc. | Miami Valley Gaming LLC      
Investments in and Advances to Affiliates [Line Items]      
Equity method investment, ownership percentage 50.00%