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 ($)
3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2019
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2019
Property, Plant and Equipment [Line Items]        
Impairment charges     $ 0  
Property carrying value $ 100,000,000.0     $ 100,000,000.0
Jeffersonville [Member]        
Property, Plant and Equipment [Line Items]        
Impairment charges $ 37,600,000 $ 49,700,000   $ 85,400,000