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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Impairment charges     $ 1.9  
Redemption of non-controlling interest     (4.0) $ 0.0
Redeemable Non-Controlling Interest (Temporary Equity)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Redemption of non-controlling interest   $ 4.0 4.0  
Louisiana        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Impairment charges $ 1.5   168.0  
Minimum Volume Contract        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Contract with customer, liability 41.4   83.2  
Contracts with customers, revenue recognition $ 13.4   $ 25.2