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Acquisitions & Divestitures Purchase Accounting Entries (Tables)
 9 Months Ended
Sep. 30, 2017
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Consideration:
 
 
Total consideration
 
$
591.0

 
 
 
Amounts recognized for fair value of assets acquired and liabilities assumed:
 
 
Proved properties
 
$
406.2

Unproved properties
 
214.2

Asset retirement obligations
 
(11.6
)
Bargain purchase gain
 
(17.8
)
Total fair value
 
$
591.0