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Income Taxes (Details 5)
 12 Months Ended
Dec. 31, 2014
United States | Minimum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2012
United States | Maximum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2014
State of Wisconsin | Minimum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2009
State of Wisconsin | Maximum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2014
CHINA | Minimum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2007
CHINA | Maximum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2014
France | Minimum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2013
France | Maximum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2014
GERMANY | Minimum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2006
GERMANY | Maximum  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2014