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Long-Lived Asset Impairment (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
CompressorUnit
hp
Jun. 30, 2014
USD ($)
CompressorUnit
hp
Jun. 30, 2015
USD ($)
CompressorUnit
hp
Jun. 30, 2014
USD ($)
CompressorUnit
hp
Idle compressor units        
Long-Lived Asset Impairment        
Number of long-lived assets that the entity determined to retire and either sell or re-utilize key components | CompressorUnit 80 130 160 170
Horsepower retired from the contract operations business | hp 52,000 35,000 82,000 46,000
Long-lived asset impairment $ 14.4 $ 9.8 $ 25.8 $ 13.7
Long-term receivable from the sale of Canadian Operations        
Long-Lived Asset Impairment        
Long-lived asset impairment     1.4  
Other long lived assets        
Long-Lived Asset Impairment        
Long-lived asset impairment $ 1.0   $ 1.0