Leases - Supplemental Operating Lease Information (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 8.7		$ 6.0
Accrued liabilities	2.0		1.9
Operating lease liabilities	7.8		5.2
Total operating lease liabilities	9.8		$ 7.1
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases for the nine months ended September 30, 2020 and 2019	$ 1.8	$ 1.4
Weighted average remaining lease term, units in years	4 years 6 months		4 years 2 months 12 days
Weighted average discount rate	5.00%		5.00%