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Background and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Minimum ownership of fully controlled entities |  | 100.00% |  |
Research and development expense |  | $ 12.1 | $ 11.8 | $ 11.7
Recognized tax benefit to be realized upon ultimate settlement |  | greater than 50 percent likely to be realized |  |
Tax cuts and jobs act of 2017, income tax expense | $ 0.8 |  |  |
Allowance for doubtful accounts | $ 0.5 | $ 0.6 | 0.5 |
Bad debt expense |  | 0.1 | 0.0 | 0.1
Depreciation expense |  | $ 10.1 | 8.9 | 8.7
Minimum | Patents and acquired technology |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 7 years |  |
Minimum | Customer relationships |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 5 years |  |
Minimum | Trade names |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 7 years |  |
Minimum | Non-competition agreements |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 5 years |  |
Maximum | Patents and acquired technology |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 20 years |  |
Maximum | Customer relationships |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 15 years |  |
Maximum | Trade names |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 10 years |  |
Maximum | Non-competition agreements |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, useful life (in years) |  | 10 years |  |
Machinery and Equipment | Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) |  | 7 years |  |
Machinery and Equipment | Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) |  | 10 years |  |
Building and Building Improvements | Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) |  | 20 years |  |
Building and Building Improvements | Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) |  | 40 years |  |
Software |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Depreciation expense |  | $ 0.6 | $ 0.5 | $ 0.5
Software | Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) |  | 3 years |  |
Software | Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) |  | 5 years |  |

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