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Segment Information - Revenue from External Customers by Products and Services (Details) - Sales | 12 Months Ended
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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%

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