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Divestiture Activities - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 13, 2021 | Jul. 12, 2019 | Feb. 13, 2019 | Mar. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Held for Sale | First Earnout |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Maximum total earnout proceeds |  |  |  |  | $ 35.0 |
Held for Sale | Test Systems |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Total cash proceeds of divesture |  |  | $ 103.8 |  |  |
Gain on sale, net of tax |  |  | 80.1 | $ 80.1 |  |
Income taxes from divesture |  |  | $ 19.7 | $ 19.7 |  |
Net property, plant and equipment |  |  |  |  |  | $ 1.5
Held for Sale | Test Systems | Subsequent Event |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Contingent earn-outs | $ 10.7 |  |  |  |  |
Disposed of by Sale | Airfield Lighting Product Line |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale |  | $ 1.0 |  |  |  |
Percentage of revenue (as a percentage) |  | 1.00% |  |  | 1.00% |
Pre-tax loss on sale |  | $ (1.3) |  |  | $ (1.3) |

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