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Acquisition (Details 1) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 04, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Trade Names |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 11 years | 10 years
Customer Lists |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 14 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 |  |
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 | 0.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |
Gaomei | Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability | 42.4 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years |
Fair Value | Contingent Consideration |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Contingent Consideration, Liability | $ 4.5 | $ 6.6 |

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