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Segment Information - Reportable Segments Adjusted Working Capital and Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  |  |  |  |  | 2018 |  |
Revenues | $ 223,800,000 | $ 236,200,000 | $ 188,400,000 | $ 178,500,000 | $ 215,500,000 | $ 196,000,000.0 | $ 164,400,000 | $ 168,300,000 | $ 826,900,000 | $ 744,200,000 | $ 755,700,000
Total assets | 1,547,900,000 |  |  |  | 1,549,800,000 |  |  |  | 1,547,900,000 | 1,549,800,000 |
Disposal Group, Including Discontinued Operation, Assets | 0 |  |  |  | 1,700,000 |  |  |  | 0 | 1,700,000 |
Operating segments | Audio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 682,200,000 | 637,400,000 | 661,900,000
Total assets | 1,409,100,000 |  |  |  | 1,430,900,000 |  |  |  | 1,409,100,000 | 1,430,900,000 |
Operating segments | Precision Devices |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 144,700,000 | 106,800,000 | $ 93,800,000
Total assets | 136,900,000 |  |  |  | 103,400,000 |  |  |  | 136,900,000 | 103,400,000 |
Intra-segment eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 1,900,000 |  |  |  | $ 13,800,000 |  |  |  | $ 1,900,000 | $ 13,800,000 |

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