Acquisitions - Asset Acquisition (Details) - USD ($) $ in Millions		9 Months Ended
	Mar. 21, 2018	Sep. 30, 2019
Marketech Asset Acquisition
Schedule Of Asset Acquisition [Line Items]
Payments for asset acquisitions	$ 2.0
Future earn-out payments	1.0
Earnout consideration liability	$ 0.3
Earn out payment		$ 0.6
Third-Party Payor | Customer relationships
Schedule Of Asset Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 1.2