Nature of Operations, Management’s Plans and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 43.9			$ 29.6			$ 43.9	$ 29.6	$ 29.1	$ 16.0
Cash on hand	10.3						10.3
Net losses	0.3	$ (24.5)	$ (17.4)	(8.5)	$ (10.7)	$ (5.0)	(41.6)	(24.2)
Share-based compensation							3.1	6.6
Depreciation, Depletion and Amortization							17.9	10.6
Net Cash Provided by (Used in) Operating Activities							31.5	22.4
Deferred Income, Noncurrent	$ 10.3			$ 11.0			$ 10.3	$ 11.0