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Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 9.0	$ 28.0
Federal NOL carryover valuation allowance	(5.0)
Operating Loss Carryforwards, Valuation Allowance	(5.0)
Federal NOL carryover	10.0
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Domestic Subsidiaries	26.0
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	109.0
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 4.0

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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