Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Sublease, remaining lease term (less than)			1 year
Rent expense	$ 1.8	$ 1.8	$ 5.5	$ 4.3
Operating lease, lease not yet commenced, undiscounted amount	$ 2.7		$ 2.7