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Segment Information - Information on Reportable Segments (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segments | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  |  |  |  |  |  | 2018 |  |
Number of reportable segments | segments |  |  |  |  |  |  |  |  |  | 2 |  |
Reconciliation from Segment Totals to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 223.8 | $ 236.2 | $ 188.4 | $ 178.5 | $ 215.5 | $ 196.0 | $ 164.4 | $ 168.3 | $ 826.9 | $ 744.2 | $ 755.7
Reconciliation of Net Earnings from Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 16.0 | 20.6 | 20.4
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | [1] |  |  |  |  |  |  |  |  | 61.1 | 19.4 | 28.1
Provision for income taxes |  |  |  |  |  |  |  |  |  | (4.5) | 12.9 | 8.3
Earnings (Loss) |  | $ 79.4 | $ (17.8) | $ 4.4 | $ (0.4) | $ 31.9 | $ 10.5 | $ (30.9) | $ (5.0) | 65.6 | 6.5 | 19.8
Reconciliation of Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 52.4 | 53.8 | 69.0
Reconciliation of Research and Development Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  | 100.6 | 93.4 | 92.0
Operating segments |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Earnings from Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings before interest and income taxes | [1] |  |  |  |  |  |  |  |  | (133.2) | (95.3) | (101.2)
Reconciliation of Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 80.1 | 49.5 | 32.2
Reconciliation of Research and Development Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  | 100.6 | 93.4 | 92.0
Operating segments | Audio |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation from Segment Totals to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 682.2 | 637.4 | 661.9
Reconciliation of Net Earnings from Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings before interest and income taxes |  |  |  |  |  |  |  |  |  | (105.7) | (76.1) | (88.8)
Reconciliation of Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 41.5 | 45.2 | 61.4
Reconciliation of Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 68.2 | 43.6 | 27.8
Reconciliation of Research and Development Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  | 94.5 | 89.0 | 89.2
Operating segments | Precision Devices |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation from Segment Totals to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 144.7 | 106.8 | 93.8
Reconciliation of Net Earnings from Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings before interest and income taxes |  |  |  |  |  |  |  |  |  | (27.5) | (19.2) | (12.4)
Reconciliation of Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 7.8 | 5.6 | 4.3
Reconciliation of Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 10.8 | 5.4 | 3.1
Reconciliation of Research and Development Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  | 5.8 | 4.2 | 2.7
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Earnings from Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings before interest and income taxes |  |  |  |  |  |  |  |  |  | 56.1 | 55.3 | 52.7
Reconciliation of Depreciation and Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3.1 | 3.0 | 3.3
Reconciliation of Capital Expenditures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1.1 | 0.5 | 1.3
Reconciliation of Research and Development Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  | $ 0.3 | $ 0.2 | $ 0.1
[1] |
| Years Ended December 31,
(in millions) | 2018 |  | 2017 |  | 2016
Revenues: |  |  |  |  |
Audio | $ | 682.2 |  |  | $ | 637.4 |  |  | $ | 661.9 |
Precision Devices | 144.7 |  |  | 106.8 |  |  | 93.8 |
Total revenues | $ | 826.9 |  |  | $ | 744.2 |  |  | $ | 755.7 |
Earnings from continuing operations before interest and income taxes: |  |  |  |  |
Audio | $ | 105.7 |  |  | $ | 76.1 |  |  | $ | 88.8 |
Precision Devices | 27.5 |  |  | 19.2 |  |  | 12.4 |
Total segments | 133.2 |  |  | 95.3 |  |  | 101.2 |
Corporate expense / other | 56.1 |  |  | 55.3 |  |  | 52.7 |
Interest expense, net | 16.0 |  |  | 20.6 |  |  | 20.4 |
Earnings before income taxes and discontinued operations | 61.1 |  |  | 19.4 |  |  | 28.1 |
(Benefit from) provision for income taxes | (4.5 | ) |  | 12.9 |  |  | 8.3 |
Earnings from continuing operations | $ | 65.6 |  |  | $ | 6.5 |  |  | $ | 19.8 |
Depreciation and amortization: |  |  |  |  |
Audio | $ | 41.5 |  |  | $ | 45.2 |  |  | $ | 61.4 |
Precision Devices | 7.8 |  |  | 5.6 |  |  | 4.3 |
Corporate | 3.1 |  |  | 3.0 |  |  | 3.3 |
Total | $ | 52.4 |  |  | $ | 53.8 |  |  | $ | 69.0 |
Capital expenditures: |  |  |  |  |
Audio | $ | 68.2 |  |  | $ | 43.6 |  |  | $ | 27.8 |
Precision Devices | 10.8 |  |  | 5.4 |  |  | 3.1 |
Corporate | 1.1 |  |  | 0.5 |  |  | 1.3 |
Total | $ | 80.1 |  |  | $ | 49.5 |  |  | $ | 32.2 |
Research and development: |  |  |  |  |
Audio | $ | 94.5 |  |  | $ | 89.0 |  |  | $ | 89.2 |
Precision Devices | 5.8 |  |  | 4.2 |  |  | 2.7 |
Corporate | 0.3 |  |  | 0.2 |  |  | 0.1 |
Total | $ | 100.6 |  |  | $ | 93.4 |  |  | $ | 92.0 |

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