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Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
Litigation Settlement, Amount Awarded from Other Party $ 12.8    
Future purchase obligations under Fluids supply agreement, aggregate 113.4    
Future purchase obligations under Fluids supply agreement, 2014 9.5    
Future purchase obligations under Fluids supply agreement, 2015 9.5    
Future purchase obligations under Fluids supply agreement, 2016 9.5    
Future purchase obligations under Fluids supply agreement, 2017 9.5    
Future purchase obligations under Fluids supply agreement, 2018 9.5    
Future purchase obligations under Fluids supply agreement, after 2018 through 2029 66.2    
Purchases under Fluids supply agreement 16.1 $ 13.3 $ 22.0
Litigation Settlement, Amount Awarded to Other Party 3.0    
Gain Loss Related to Litigation Settlement EPIC $ 2.8