Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, at federal statutory income tax rate	25.00%	25.00%	25.00%
Operating loss carryforwards	$ 62.3
Operating loss carryforwards, expiring in next three years	11.2
Operating loss carryforwards, expiring in years four, five and six	5.2
Operating loss carryforwards, expiring in years seven, eight and nine	7.0
Operating loss carryforwards, expiring thereafter	15.9
Deferred tax assets, operating loss carryforwards, not subject to expiration	23.0
Expired net operating loss carryforwards	0.0
Unrecognized tax benefits, income tax penalties and interest expense	0.9	$ 1.3	$ 0.6
Unrecognized tax benefits, income tax penalties and interest accrued	4.2	5.1	3.9
Unrecognized tax benefits that would impact effective tax rate	$ 0.5	$ 0.9	$ 0.6