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Investment In and Advances to Unconsolidated Affiliates - Additional Information (Details)
$ in Millions
12 Months Ended
Mar. 05, 2019
USD ($)
Dec. 31, 2020
USD ($)
joint_venture
Dec. 31, 2019
USD ($)
joint_venture
Dec. 31, 2018
USD ($)
Mar. 06, 2019
Aug. 31, 2018
Aug. 30, 2018
Jul. 16, 2018
Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]                  
Number of immaterial joint ventures | joint_venture   2 2            
Distributions from unconsolidated affiliates   $ 30.7 $ 38.1 $ 19.8          
Deferred tax liability   $ 213.9 $ 212.8            
Miami Valley Gaming LLC                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage   50.00% 50.00%            
Equity method investment, amount   $ 110.1 $ 110.8            
Distributions from unconsolidated affiliates   $ 20.0 $ 23.8 $ 18.8          
Midwest Gaming Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage 42.00% 61.30% 61.30%   61.30%        
Equity method investment, amount   $ 519.0 $ 522.1            
Distributions from unconsolidated affiliates   10.7 $ 14.2            
Aggregated cash consideration paid at closing of the Sale Transaction $ 406.6                
Deferred tax liability 103.2                
Carrying value of equity method investment 835.0 $ 833.3              
Midwest Gaming Holdings, LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees                  
Schedule of Equity Method Investments [Line Items]                  
Goodwill and indefinite-lived intangible assets 853.7                
Midwest Gaming Holdings, LLC | Grandstands and buildings                  
Schedule of Equity Method Investments [Line Items]                  
Property and equipment, net (9.5)                
Property, plant, and equipment, useful life   35 years 3 months 18 days              
Midwest Gaming Holdings, LLC | Land                  
Schedule of Equity Method Investments [Line Items]                  
Property and equipment, net (13.7)                
Midwest Gaming Holdings, LLC | Personal property                  
Schedule of Equity Method Investments [Line Items]                  
Carrying value of equity method investment   $ 4.5              
Property, plant, and equipment, useful life   3 years 8 months 12 days              
Clairvest Group Inc.                  
Schedule of Equity Method Investments [Line Items]                  
Transaction costs and working capital adjustments 3.5                
Ocean Downs                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage           100.00% 50.00% 50.00% 50.00%
Saratoga Casino Holdings LLC                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage           25.00%   25.00%  
Delaware North Companies Gaming & Entertainment Inc. | Miami Valley Gaming LLC                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage   50.00%              
Midwest Gaming Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Proceeds from new credit facilities $ 300.0                
High Plaines | Midwest Gaming Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage         36.00%        
Midwest Gaming and Casino Investors | Midwest Gaming Holdings, LLC                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage         2.70%