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Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 38.9	$ 83.4
Federal NOL carryover valuation allowance	(9.7)
Valuation Allowance, Amount	(13.6)	$ (37.9)
Federal NOL carryover	42.4
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	6.2
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	14.1
Operating Loss Carryforwards, Valuation Allowance	(1.4)
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	16.7
Federal NOL carryover valuation allowance	0.0
Deferred Tax Assets, Tax Credit Carryforwards	2.7
Operating Loss Carryforwards, Valuation Allowance	0.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	(0.1)
Deferred Tax Assets, Tax Credit Carryforwards	0.7
Capital Loss Carryforward [Member] | Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	(6.2)
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	2.0
Operating Loss Carryforwards, Valuation Allowance	$ (2.0)

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- Definition

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

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