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Intangible Contract Assets and Liabilities - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sales Contracts                    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]                    
Presented periods amortization $ 5.3 $ 24.0 $ 16.9 $ 78.4            
Take-or-pay contracts                    
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]                    
Presented periods amortization $ 2.7 $ 5.4 $ 13.9 $ 21.5            
Scenario, Forecast | Sales Contracts                    
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]                    
Remainder of 2019                   $ 6.0
2020                 $ 11.0  
2021               $ 2.0    
2022             $ 1.0      
2023           $ 1.0        
Scenario, Forecast | Take-or-pay contracts                    
Finite-Lived Intangible Liabilities, Net, Amortization Expense, Fiscal Year Maturity [Abstract]                    
Remainder of 2019                   $ 3.0
2020                 $ 8.0  
2021               $ 4.0    
2022             $ 3.0      
2023           $ 2.0        
2024 and thereafter         $ 21.0