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Chapter 11 Proceedings - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Apr. 12, 2017
Feb. 08, 2017
Nov. 21, 2016
Bankruptcy Proceedings [Line Items]        
Petition date Apr. 29, 2016      
Court where petition was filed United States Bankruptcy Court for the Southern District of Texas (the “Bankruptcy Court”)      
Plan confirmed date Mar. 14, 2017      
Plan expected to be effective date Apr. 12, 2017      
Claims settled $ 399.0      
BCA        
Bankruptcy Proceedings [Line Items]        
Rights offering, aggregate purchase price       $ 580.0
Barclays Bank PLC        
Bankruptcy Proceedings [Line Items]        
Secured and unsecured financing provided by Barclays     $ 2,400.0  
Prepetition Credit Agreement        
Bankruptcy Proceedings [Line Items]        
Claims settled   $ 999.0    
Prepetition Senior Notes        
Bankruptcy Proceedings [Line Items]        
Claims settled   1,460.0    
Senior Unsecured Notes Due 2018        
Bankruptcy Proceedings [Line Items]        
Claims settled   450.0    
Senior Unsecured Notes Due 2024        
Bankruptcy Proceedings [Line Items]        
Claims settled   $ 850.0