Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 68.1
Deferred tax liability	0.2
Tax expense associated with deferred tax asset valuation allowance	6.2
Valuation allowance, DTA, increase (decrease)	$ 3.0	$ (4.1)
Effective income tax rate	7.60%	18.90%	(141.80%)
Federal statutory tax rate	21.00%	21.00%
Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 0.1
Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	7.2
Operating loss carryforwards	24.5
Operating loss carryforwards for unlimited period	50.2
State | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 20.7