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Commitments and Contingencies Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Drilling Rig Commitment [Domain]    
Other Commitments [Line Items]    
Gain (Loss) on Contract Termination $ (2.2) $ (8.1)
Through-put Commitment [Domain]    
Other Commitments [Line Items]    
Unrecorded Unconditional Purchase Obligation $ 142.7 $ 142.7