Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 15.8	$ 38.9
Federal NOL carryover valuation allowance	(6.5)
Valuation Allowance, Amount	(12.0)	$ (13.6)
Federal NOL carryover	16.2
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Domestic Subsidiaries	22.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	9.9
Operating Loss Carryforwards, Valuation Allowance	(0.5)
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	0.0
Deferred Tax Assets, Tax Credit Carryforwards	0.1
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	(0.1)
Deferred Tax Assets, Tax Credit Carryforwards	0.3
Capital Loss Carryforward [Member] | Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	5.7
Valuation Allowance, Amount	(5.7)
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	0.2
Operating Loss Carryforwards, Valuation Allowance	$ (0.2)