Segment Information - Revenue from External Customers by Products and Services (Details) - Sales	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Breathing Apparatus
Revenue from External Customer [Line Items]
Concentration risk (percentage)	26.00%	27.00%	19.00%
Fixed Gas and Flame Detection
Revenue from External Customer [Line Items]
Concentration risk (percentage)	21.00%	21.00%	23.00%
Portable Gas Detection
Revenue from External Customer [Line Items]
Concentration risk (percentage)	12.00%	13.00%	15.00%
Head Protection
Revenue from External Customer [Line Items]
Concentration risk (percentage)	10.00%	11.00%	13.00%
Fire & Rescue Helmets
Revenue from External Customer [Line Items]
Concentration risk (percentage)	5.00%	5.00%	5.00%
Fall Protection
Revenue from External Customer [Line Items]
Concentration risk (percentage)	8.00%	5.00%	4.00%
Other
Revenue from External Customer [Line Items]
Concentration risk (percentage)	18.00%	18.00%	21.00%