Income Taxes, Valuation Allowance (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Deferred Tax Assets Operating Loss Carryforwards Utilized or Expired [Member]
Valuation Allowance [Line Items]
Changes in valuation allowances for deferred tax assets	$ 10.7
Deferred Tax Assets Operating Loss Carryforwards Established or Continued [Member]
Valuation Allowance [Line Items]
Changes in valuation allowances for deferred tax assets	$ 7.4