Leases - Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating Leases:
Weighted-average remaining lease term	7 years 21 days		7 years 21 days		7 years 9 months 14 days
Weighted-average discount rate used in the measurement of our lease liabilities	6.46%		6.46%		6.67%
Operating lease costs	$ 2.8	$ 2.8	$ 5.8	$ 5.6
Variable lease costs	$ 0.6	$ 0.5	1.1	0.9
Cash paid for amounts included in the measurement of operating lease liabilities			$ 5.6	$ 5.1