Income Taxes (NOL Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	$ 16.8	$ 25.5
Future taxable income needed to realize deferred tax assets	176.6
Foreign
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards subject to expiration	26.3
The Netherlands
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	24.8	16.9
Portugal
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	0.6	1.8
China
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	0.9	1.3
U.S. Federal
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	23.0	53.8
Deferred tax assets, operating loss carryforwards subject to expiration	23.0
Deferred tax assets, tax deferred expense, compensation and benefits, share-based compensation cost	6.6
U.S. State and Local Jurisdictions
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	58.6	$ 68.5
Deferred tax assets, operating loss carryforwards subject to expiration	$ 58.6