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Acquisition (Details 1) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 04, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Trade Names |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 11 years | 11 years |
Customer Lists |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years | 15 years |
Gaomei |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Name of Acquired Entity | Hefei Gaomei Cleaning Machines Co., Ltd. and Anhui Rongen Environmental Protection Technology Co., Ltd. (collectively "Gaomei") |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 0.0 |  |  |
Business Combination, Working Capital Adjustment |  |  | $ (0.2) |
Recorded Unconditional Purchase Obligation |  |  |  | $ 11.3
Purchase Obligation, Due in Second Year |  |  | 11.3 |
Gaomei | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability | 1.4 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |  |
Gaomei | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability | 3.1 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years |  |
Fair Value | Contingent Consideration |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 4.7 | $ 1.8 | $ 2.1 |

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