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Revenue from Contracts with Customers - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Contract terms	Generally, contracts are billed in arrears on a quarterly basis and have a three year duration, after which the customer can terminate the agreement with a six to twelve month notice.
Termination period	60 days
Minimum
Disaggregation of Revenue [Line Items]
Termination period	6 months
Maximum
Disaggregation of Revenue [Line Items]
Termination period	12 months
Stewardship
Disaggregation of Revenue [Line Items]
Fixed future revenue, quarterly	$ 3

X

- Definition

Revenue, Performance Obligation, Notice Of Termination, Period

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130554-203045

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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