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Accounting for Derivatives (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Fair Value Asset (Liability)    
Interest income recorded due to ineffectiveness related to interest rate swaps $ 0.4 $ 0.0
Deferred pre-tax losses to be reclassified during next 12 months 5.2  
Designated as a hedging instrument | Interest rate hedges | Exterran Partners, L.P.    
Fair Value Asset (Liability)    
Notional value of interest rate swaps entered into during the period 100.0  
Notional amount of interest rate swaps $ 500.0  
Weighted average effective fixed interest rate on interest rate swaps (as a percent) 1.60%  
Designated as a hedging instrument | Interest rate hedges | Derivative expiring in 2018 | Exterran Partners, L.P.    
Fair Value Asset (Liability)    
Notional amount of interest rate swaps $ 300.0  
Designated as a hedging instrument | Interest rate hedges | Derivative expiring in 2019 | Exterran Partners, L.P.    
Fair Value Asset (Liability)    
Notional amount of interest rate swaps 100.0  
Designated as a hedging instrument | Interest rate hedges | Derivative expiring in 2020 | Exterran Partners, L.P.    
Fair Value Asset (Liability)    
Notional amount of interest rate swaps $ 100.0