Segment Reporting - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Asset optimization revenue	$ 12.7	$ 32.7	$ 36.1	$ 110.9
Asset optimization cost of revenues	$ 12.8	$ 31.9	$ 33.6	$ 107.4