Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details)

v3.19.2
Financial Instruments (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Bcf
Not Designated as Hedging Instrument | Non-current asset    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross $ 0.2 $ 0.2
Not Designated as Hedging Instrument | Current asset    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross 3.7 3.7
Not Designated as Hedging Instrument | Current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross 0.1 0.1
Not Designated as Hedging Instrument | Non-current liability    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross 0.3 $ 0.3
Commodity swaps    
Derivatives, Fair Value [Line Items]    
Hedged portions of expected sales of equity production | Bcf   15.6
Commodity swaps | Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Realized gain on derivatives 0.3 $ 0.5
Unrealized gain on derivatives 4.7 $ 3.5
Basis Swap    
Derivatives, Fair Value [Line Items]    
Hedged portions of expected sales of equity production | Bcf   15.6
Level 2 | Commodity swaps | Not Designated as Hedging Instrument | Prepaid and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative assets (liabilities), net 3.6 $ 3.6
Level 2 | Commodity swaps | Not Designated as Hedging Instrument | Non-current liability    
Derivatives, Fair Value [Line Items]    
Derivative assets (liabilities), net $ (0.1) $ (0.1)