Income Taxes Income Taxes - Amount and Expiration Dates of Tax Loss Carry Forwards (Not Tax Effected) and Credit Carry Forwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Internal Revenue Service (IRS) | Expiration Date 2020 to Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 37.8
Internal Revenue Service (IRS) | Expiration Date 2024 to 2039
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	15.6
Capital Loss Carryforward | Expiration Date 2020 to 2024
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 34.5