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Long-Lived Asset Impairment (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Fabrication
Jun. 30, 2013
Idle compressor units
hp
item
Jun. 30, 2012
Idle compressor units
item
hp
Jun. 30, 2013
Other long lived assets
Jun. 30, 2012
Other long lived assets
Jun. 30, 2012
Idle compressor units previously impaired
Long-Lived Asset Impairment            
Number of long-lived assets that the entity determined to retire and either sell or re-utilize key components   170 920      
Horsepower retired from the contract operations business   40,000 316,000      
Long-lived asset impairment   $ 7.1 $ 96.5 $ 1.1 $ 1.5  
Long-lived asset impairment 11.9          
Additional long-lived asset impairment           $ 34.8