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Revenue from Contracts with Customers - Narrative (Details) $ in Millions | 9 Months Ended
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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

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