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Property and Equipment - Additional Disclosures (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($) item	Dec. 31, 2017 USD ($)
Property and Equipment
Depreciation expense	$ 24.3	$ 23.3
Gain on disposition of units	0.3	$ 0.2
Insurance Recoveries	0.6
Number Of Compressor Units That Are To Be Retired Or Sold Or Reutilized | item		2
Accounts payable and accrued liabilities
Property and Equipment
Purchases of property and equipment	$ 25.6		$ 10.8

X

- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

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

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Represents the number of compressor units that are to be retired or sold or reutilized.

+ References

No definition available.

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