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Restructuring (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.1 | $ 0.4 | $ 1.2 | $ 0.6 | $ 1.7 | $ 0.4
Payments for restructuring |  |  |  |  |  |  |  | (0.7) | (1.3) |
Severance costs |  |  |  | $ 0.7 |  |  |  |  |  |
Restructuring Reserve | $ 0.3 |  |  |  | $ 0.4 |  |  | 0.3 | 0.4 | $ 0.0
Operating Segments | Safety And Security Systems | Facility Closing |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  | $ 0.6 |  |
Operating Segments | Safety And Security Systems | Voluntary Reduction-In-Force Plan |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Severance costs |  |  |  |  |  |  |  |  | $ 1.7 |

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