Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 7.0	$ 9.0
Federal NOL carryover valuation allowance	(6.0)
Federal NOL carryover	7.0
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Domestic Subsidiaries	23.0
State Credit Carryforwards
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	0.0
Federal NOL carryover	1.0
Canadian Capital Loss Carryforwards
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Valuation Allowance	(6.0)
Federal NOL carryover	$ 6.0