Revenue from Contracts with Customers - Narrative (Details)	9 Months Ended
	Sep. 30, 2020
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 notice, generally from three to twelve months.
Minimum
Disaggregation of Revenue [Line Items]
Termination period	3 months
Maximum
Disaggregation of Revenue [Line Items]
Termination period	12 months