Leases - Schedule of Other Information Related to Operating and Finance Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Short-term lease costs	$ 0.3	$ 1.1	$ 1.7	$ 4.4
Operating lease cost	0.7	0.9	2.1	2.2
Operating cash outflows from operating leases	$ 0.7	$ 0.8	$ 2.1	$ 2.2
Weighted average remaining lease term	6 years	5 years 9 months 18 days	6 years	5 years 9 months 18 days
Weighted average discount rate	9.30%	9.30%	9.30%	9.30%
Amortization of finance leases	$ 1.0	$ 1.3	$ 3.8	$ 3.8
Interest on lease liabilities	0.1	0.2	0.4	0.6
Financing cash outflows from finance leases	$ 1.1	$ 1.3	$ 3.7	$ 3.5
Weighted average remaining lease term	1 year 4 months 24 days	1 year 7 months 6 days	1 year 4 months 24 days	1 year 7 months 6 days
Weighted average discount rate	3.90%	4.40%	3.90%	4.40%