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Long-Lived Asset Impairment (Details) hp in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) compressor_unit hp	Sep. 30, 2014 USD ($) compressor_unit hp	Sep. 30, 2015 USD ($) compressor_unit hp	Sep. 30, 2014 USD ($) compressor_unit 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 | compressor_unit	155	70	315	240
Horsepower retired from the contract operations business (in horsepower) | hp	54	26	136	72
Long-lived asset impairment	$ 11.9	$ 7.9	$ 37.7	$ 21.5
Long-term receivable from the sale of Canadian Operations
Long-Lived Asset Impairment
Long-lived asset impairment			1.4
Previously Impaired Assets
Long-Lived Asset Impairment
Long-lived asset impairment	$ 11.8	$ 4.5	$ 12.8	$ 4.5

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- Definition

The number of long-lived assets that the entity determined to retire and either sell or re-utilize key components.

+ References

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The capacity of long-lived assets that the entity determined to retire and either sell or re-utilize key components, expressed in horsepower.

+ References

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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