Revenues - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) segment
Deferred Revenue Arrangement [Line Items]
Number of reportable segments | segment		2
Contract with customer, liability, revenue recognized in the period	$ 5.2	$ 21.8
Deferred revenue, noncurrent recognition period		4 years
Remaining performance obligation	$ 137.0	$ 137.0