Income Tax Returns to be Reviewed (Details)	12 Months Ended
	Dec. 31, 2014
UNITED STATES
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2009
CANADA
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2007
UNITED KINGDOM
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2013
CHINA
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2011
JAPAN
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2009
GERMANY
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2008
NETHERLANDS
Income Tax Examination [Line Items]
Income tax returns to be reviewed	2009