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Related Party Transactions - Payments, Acquisition and Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2017
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Related Party Transactions                    
Increase in borrowings on related party debt                 $ 21.0  
CSL and Board Members                    
Related Party Transactions                    
Related party expenses             $ 1.0 $ 0.0 0.4 $ 0.0
Amount due to related parties             0.2   0.2  
CSL | Allied Purchase Agreement                    
Related Party Transactions                    
Assets purchased from a related party           $ 4.0        
Ranger Bridge Loan                    
Related Party Transactions                    
Related party note payable $ 21.0 $ 17.1   $ 12.1 $ 11.1   17.1   17.1  
Carrying value of assets used to secure debt             $ 132.1   $ 132.1  
Interest rate (as a percent)         15.00%          
Period after the consummation of an initial public offering that the debt may become due         10 days          
Percentage of the total amount advanced to be paid upon settlement         125.00%          
Increase in borrowings on related party debt $ 3.9 $ 2.5 $ 2.5 $ 1.0            
Ranger Bridge Loan | CSL Opportunities II                    
Related Party Transactions                    
Related party note payable         $ 4.4          
Ranger Bridge Loan | CSL Holdings II                    
Related Party Transactions                    
Related party note payable         3.2          
Ranger Bridge Loan | Bayou Well Holdings Company, LLC                    
Related Party Transactions                    
Related party note payable         $ 3.6