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Acquisition and Disposition of Properties - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 15, 2016
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
MMBoe
Gas and Oil Acreage [Line Items]              
Payment for unproved leasehold         $ 27.2 $ 46.0  
San Juan Basin              
Gas and Oil Acreage [Line Items]              
Amount of consideration received   $ 395.0   $ 395.0      
Purchase price adjustments       11.0      
Pre-tax proceeds       $ 384.0      
Transaction costs   2.8          
Proved developed reserves (MMBOE) | MMBoe             69.038
San Juan | San Juan Basin              
Gas and Oil Acreage [Line Items]              
Pre-tax gain on disposal   $ 27.0          
Held-for-sale | Permian Basin              
Gas and Oil Acreage [Line Items]              
Amount of consideration received     $ 294.0   $ 294.0    
Purchase price adjustments     9.6        
Pre-tax proceeds     284.8        
Transaction costs     2.5        
Pre-tax gain on disposal     $ 161.1        
Subsequent Event | Disposal group | San Juan Basin              
Gas and Oil Acreage [Line Items]              
Amount of consideration received $ 77.5            
Purchase price adjustments 2.7            
Pre-tax proceeds 74.8            
Transaction costs $ 0.5