Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Note to Financial Statements
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Amount of deferred tax liability that can potentially offset deferred tax assets	$ 31.9
Deferred Tax Assets, Valuation Allowance, Total	0.0	$ 0.0
Income Tax Examination, Penalties and Interest Expense, Total	$ 0.0