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Long-Lived Asset Impairment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 CompressorUnit hp	Mar. 31, 2014 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	80	40
Horsepower retired from the contract operations business	30,000	11,000
Long-lived asset impairment	$ 11.3	$ 3.8
Other long lived assets
Long-Lived Asset Impairment
Long-lived asset impairment	$ 1.4

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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