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Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial Assets    
Netting Adjustments [1] $ 0.0 $ (0.4)
Derivative Asset 1.7 123.2
Financial liabilities    
Netting Adjustments [1] 0.0 (0.4)
Derivative Liability 19.2 0.7
Haynesville Divestiture [Member]    
Financial Assets    
Derivative instruments   0.3
Level 1 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Level 2 [Member]    
Financial Assets    
Derivative instruments 1.7 123.6
Financial liabilities    
Derivative instruments 19.2 1.1
Level 3 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Long term [Member]    
Financial Assets    
Netting Adjustments [1] 0.0 0.0
Derivative Asset 0.2 35.4
Financial liabilities    
Netting Adjustments [1] 0.0 0.0
Derivative Liability 0.5 0.7
Long term [Member] | Level 1 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Long term [Member] | Level 2 [Member]    
Financial Assets    
Derivative instruments 0.2 35.4
Financial liabilities    
Derivative instruments 0.5 0.7
Long term [Member] | Level 3 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Short term [Member]    
Financial Assets    
Netting Adjustments [1] 0.0 (0.4)
Derivative Asset 1.5 87.8
Financial liabilities    
Netting Adjustments [1] 0.0 (0.4)
Derivative Liability 18.7 0.0
Short term [Member] | Level 1 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Short term [Member] | Level 2 [Member]    
Financial Assets    
Derivative instruments 1.5 88.2
Financial liabilities    
Derivative instruments 18.7 0.4
Short term [Member] | Level 3 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments $ 0.0 $ 0.0
[1]
The Company nets its derivative contract assets and liabilities outstanding with the same counterparty on the Consolidated Balance Sheets for the contracts that contain netting provisions. Refer to Note 7 – Derivative Contracts for more information regarding the Company's derivative contracts.