Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details)

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Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2020
Foxwoods [Member]        
Property, Plant and Equipment [Line Items]        
Impairment charges $ 45.7   $ 60.1  
Jeffersonville [Member]        
Property, Plant and Equipment [Line Items]        
Impairment charges   $ 37.6   $ 86.8