Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 32.8
Federal NOL carryover	158.3
Federal NOL carryover valuation allowance	(48.6)
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	32.2
Valuation Allowance, Amount	(56.1)	$ (32.3)
Deferred Tax Assets, Operating Loss Carryforwards	137.3	$ 134.0
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	6.9
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	0.6
Operating Loss Carryforwards, Valuation Allowance	(13.1)
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	1.0
Operating Loss Carryforwards, Valuation Allowance	(0.7)
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	(2.1)
Deferred Tax Assets, Operating Loss Carryforwards	63.8
Deferred Tax Assets, Tax Credit Carryforwards	2.1
Operating Loss Carryforwards, Valuation Allowance	(24.6)
UNITED STATES
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	0.0
Deferred Tax Assets, Tax Credit Carryforwards	18.1
Operating Loss Carryforwards, Valuation Allowance	0.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	(0.6)
Deferred Tax Assets, Tax Credit Carryforwards	0.8
Capital Loss Carryforward [Member] | Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	(6.9)
Capital Loss Carryforward [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	$ (0.6)