Income Taxes (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating loss carryforwards
Valuation allowance against deferred tax assets related to buildings	$ 17.3	$ 18.2
UK
Operating loss carryforwards
Amount of tax credit carryforwards not subject to expiration	5.6
Net operating loss carryforwards not subject to expiration	0.2
Valuation allowance against deferred tax assets related to buildings	7.8
German
Operating loss carryforwards
Net operating loss carryforwards not subject to expiration	18.5
Valuation allowance against net operating loss carryforwards	7.2
Australia
Operating loss carryforwards
Net operating loss carryforwards not subject to expiration	21.5
New Zealand
Operating loss carryforwards
Net operating loss carryforwards not subject to expiration	1.7
Italian
Operating loss carryforwards
Net operating loss carryforwards not subject to expiration	0.1
State
Operating loss carryforwards
Net operating loss carryforwards that expire at various dates	63.4
Net operating loss carryforwards utilized	20.3
Valuation allowance against net operating loss carryforwards	2.0
Valuation allowance against state credit carryforwards	0.3
Federal and state
Operating loss carryforwards
Amount of tax credit carryforwards not subject to expiration	$ 2.5