Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Outstanding letters of credit	$ 15.7	$ 3.6
Accrued liabilities for remediation	2.0
Indemnification Agreement
Loss Contingencies [Line Items]
Indemnification expense	$ 3.4