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Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impairment charges   $ 1,900,000  
Redemption of non-controlling interest   (4,000,000.0) $ 0
Redeemable Non-Controlling Interest (Temporary Equity)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Redemption of non-controlling interest   4,000,000.0  
Louisiana      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impairment charges $ 0 168,000,000.0  
Minimum Volume Contract      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Contract with customer, liability 44,800,000 128,000,000.0  
Contracts with customers, revenue recognition $ 14,000,000.0 $ 39,200,000